Zieralgen (Desmidiales)

German Red List

Kusber, W.-H. & Gutowski, A. (2018): Rote Liste und Gesamtartenliste der Zieralgen (Desmidiales) Deutschlands. – In: Metzing, D., Hofbauer, N., Ludwig, G. & Matzke-Hajek, G. (Bearb.): Rote Liste der gefährdeten Tiere, Pflanzen und Pilze Deutschlands. Band 7: Pflanzen. – Bonn (Bundesamt für Naturschutz). – Naturschutz und Biologische Vielfalt 70 (7): 711–778.

Comment: The German national Red List threat categories do not correspond with the international IUCN categories.

Checklist

Scientific name German name Threat Category
A
Actinotaenium capax var. minus (Schmidle) Teiling ex Růžička & Pouzar 1978 Threatened
Actinotaenium clevei (P. Lundell) Teiling 1954 Highly Threatened
Actinotaenium colpopelta (Bréb.) Compère 1976 Highly Threatened
Actinotaenium crassiusculum (de Bary) Teiling 1954 Highly Threatened
Actinotaenium cruciferum (de Bary) Teiling 1954 Threatened
Actinotaenium cucurbita (Bréb.) Teiling ex Růžička & Pouzar 1978 Threatened
Actinotaenium cucurbitinum (Prescott) G.H. Tomaszewicz 1988 var. cucurbitinum Threatened
Actinotaenium cucurbitinum var. minutum (Prescott) G.H. Tomaszewicz 1988 Threat of Unknown Extent
Actinotaenium curtum (Bréb.) Teiling 1954 ex Růžička & Pouzar 1978 Highly Threatened
Actinotaenium didymocarpum (P. Lundell) Coesel & Delfos 1986 Extremely Rare
Actinotaenium diplosporum (P. Lundell) Teiling 1954 f. diplosporum Highly Threatened
Actinotaenium diplosporum f. maius (West) Coesel 1984 Threat of Unknown Extent
Actinotaenium diplosporum var. americanum (G.S. West) Teiling 1954 Data Deficient
Actinotaenium gelidum (Wittr.) Růžička 1978 Data Deficient
Actinotaenium hibernicum (West) Růžička 1978 Highly Threatened
Actinotaenium inconspicuum (West & G.S. West) Teiling 1954 Highly Threatened
Actinotaenium kriegeri (Messik.) Kouwets 1997 Threatened
Actinotaenium mooreanum (W. Archer) Teiling 1954 Threatened
Actinotaenium obcuneatum (West) Teiling 1954 Data Deficient
Actinotaenium palangula (Bréb.) Teiling ex Růžička & Pouzar 1978 Highly Threatened
Actinotaenium perminutum (G.S. West) Teiling 1954 Highly Threatened
Actinotaenium phymatosporum (Nordst.) Kouwets & Coesel 1984 Highly Threatened
Actinotaenium riethii Šťastný & Kouwets 2012 Data Deficient
Actinotaenium rufescens (Cleve) Teiling 1954 Highly Threatened
Actinotaenium silvae-nigrae (Rabanus) Kouwets & Coesel 1984 var. silvae-nigrae Highly Threatened
Actinotaenium silvae-nigrae var. parallelum (Willi Krieg.) Kouwets & Coesel 1984 Highly Threatened
Actinotaenium spinospermum (Joshua) Kouwets & Coesel 1984 Highly Threatened
Actinotaenium subtile (West & G.S. West) Teiling 1954 Extremely Rare
Actinotaenium truncatum (Bréb.) Teiling ex Růžička & Pouzar 1978 Threat of Unknown Extent
Actinotaenium turgidum (Bréb.) Teiling ex Růžička & Pouzar 1978 Highly Threatened
B
Bambusina borreri (Ralfs) Cleve 1864 Threatened
C
Closterium abruptum West 1892 var. abruptum Threatened
Closterium abruptum var. brevius (West & G.S. West) West & G.S. West 1904 Highly Threatened
Closterium acerosum Ralfs 1848 var. acerosum Not Threatened
Closterium acerosum var. angolense West & G.S. West 1897 Data Deficient
Closterium acerosum var. elongatum Bréb. 1856 Not Threatened
Closterium acerosum var. minus Hantzsch 1868 Data Deficient
Closterium aciculare West 1860 Not Threatened
Closterium acutum Ralfs 1848 var. acutum Not Threatened
Closterium acutum var. linea (Perty) West & G.S. West 1900 Not Threatened
Closterium acutum var. variabile (Lemmerm.) Willi Krieg. 1935 Not Threatened
Closterium angustatum Ralfs 1848 var. angustatum Threatened
Closterium angustatum var. sculptum (Racib.) Růžička 1973 Data Deficient
Closterium archerianum Cleve 1871 var. archerianum Highly Threatened
Closterium archerianum var. pseudocynthia Růžička 1973 Data Deficient
Closterium attenuatum Ralfs 1848 Highly Threatened
Closterium baillyanum (Ralfs) Bréb. 1856 var. baillyanum Threatened
Closterium baillyanum var. alpinum (Viret) Grönblad 1919 Data Deficient
Closterium braunii Reinsch 1867 Data Deficient
Closterium calosporum Wittr. 1869 var. calosporum Threatened
Closterium calosporum var. brasiliense Børgesen 1891 Data Deficient
Closterium calosporum var. maius (West & G.S. West) Willi Krieg. 1935 Data Deficient
Closterium ceratium Perty 1852 Data Deficient
Closterium closterioides (Ralfs) A. Louis & Peeters 1967 var. closterioides Threatened
Closterium closterioides var. intermedium (J. Roy & Bisset) Růžička 1973 Data Deficient
Closterium cornu Ralfs 1848 var. cornu Threatened
Closterium cornu var. upsaliense Nordst. 1889 Data Deficient
Closterium costatum Ralfs 1848 var. costatum Highly Threatened
Closterium costatum var. borgei (Willi Krieg.) Růžička 1972 Data Deficient
Closterium cynthia De Not. 1867 var. cynthia Threatened
Closterium cynthia var. latum (Schmidle) Willi Krieg. 1935 Data Deficient
Closterium delpontei (G.A. Klebs) Wolle 1885 Highly Threatened
Closterium dianae Ralfs 1848 var. dianae Threatened
Closterium dianae var. arcuatum (Bréb.) Rabenh. 1868 Data Deficient
Closterium dianae var. brevius (Petkoff) Willi Krieg. 1935 Data Deficient
Closterium dianae var. minus Hieron. 1895 Highly Threatened
Closterium dianae var. pseudodianae (J. Roy) Willi Krieg. 1935 Data Deficient
Closterium dianae var. rectius (Nordst.) De Toni 1889 Data Deficient
Closterium didymotocum Ralfs 1848 Threatened
Closterium directum W. Archer 1862 var. directum Threatened
Closterium directum var. oligocampylum (Schmidle) Růžička 1975 Data Deficient
Closterium eboracense W.B. Turner 1886 Highly Threatened
Closterium ehrenbergii Ralfs 1848 var. ehrenbergii Not Threatened
Closterium ehrenbergii var. atumidum Grönblad 1935 Data Deficient
Closterium ehrenbergii var. malinvernianum (De Not.) Rabenh. 1868 Data Deficient
Closterium exiguum West & G.S. West 1902 Data Deficient
Closterium exile West & G.S. West 1905 Threatened
Closterium gracile Ralfs 1848 var. gracile Threatened
Closterium gracile var. elongatum West & G.S. West 1904 Threatened
Closterium gracile var. striolatum Willi Krieg. 1935 Data Deficient
Closterium idiosporum West & G.S. West 1900 Threatened
Closterium incurvum Bréb. 1856 Threatened
Closterium intermedium Ralfs 1848 var. intermedium Threatened
Closterium intermedium var. hibernicum West & G.S. West 1894 Not established
Closterium jenneri Ralfs 1848 var. jenneri Highly Threatened
Closterium jenneri var. robustum G.S. West 1899 Data Deficient
Closterium juncidum Ralfs 1848 var. juncidum Threatened
Closterium juncidum var. brevius (Rabenh.) J. Roy 1890 Threatened
Closterium juncidum var. elongatum J. Roy 1884 Data Deficient
Closterium kuetzingii Bréb. 1856 var. kuetzingii Not Threatened
Closterium kuetzingii var. vittatum Nordst. 1887 Data Deficient
Closterium lanceolatum Ralfs 1848 Highly Threatened
Closterium laterale Nordst. 1880 Extremely Rare
Closterium leibleinii Ralfs 1848 var. leibleinii Not Threatened
Closterium leibleinii var. boergesenii (Schmidle) Skvortsov 1932 Data Deficient
Closterium limneticum Lemmerm. 1899 var. limneticum Not Threatened
Closterium limneticum var. fallax Růžička 1962 Not Threatened
Closterium limneticum var. tenue Lemmerm. 1899 Not Threatened
Closterium lineatum Ralfs 1848 var. lineatum Threatened
Closterium lineatum var. elongatum (Rosa) Croasdale 1955 Data Deficient
Closterium littorale F. Gay 1884 var. littorale Not Threatened
Closterium littorale var. crassum West & G.S. West 1896 Not Threatened
Closterium lundellii Lagerh. 1883 Data Deficient
Closterium lunula Ralfs 1848 var. lunula Not Threatened
Closterium lunula var. biconvexum Schmidle 1895 Data Deficient
Closterium lunula var. intermedium Gutw. 1896 Data Deficient
Closterium macilentum Bréb. 1856 Data Deficient
Closterium macilentum var. japonicum (Suringar) Willi Krieg. 1935 Not established
Closterium moniliferum Ralfs 1848 var. moniliferum Not Threatened
Closterium moniliferum var. concavum G.A. Klebs 1879 Data Deficient
Closterium moniliferum var. submoniliferum (Woron.) Willi Krieg. 1935 Data Deficient
Closterium navicula (Bréb.) Lütkem. 1902 var. navicula Threatened
Closterium navicula var. crassum (West & G.S. West) Grönblad 1920 Threatened
Closterium nematodes var. proboscideum W.B. Turner 1862 Highly Threatened
Closterium nordstedtii var. polystictum (Nygaard) Růžička 1975 Data Deficient
Closterium parvulum Nägeli 1849 var. parvulum Not Threatened
Closterium parvulum var. angustum West & G.S. West 1900 Data Deficient
Closterium parvulum var. maius (Schmidle) Willi Krieg. 1935 Data Deficient
Closterium porrectum Nordst. 1870 Data Deficient
Closterium praelongum Bréb. 1856 var. praelongum Not Threatened
Closterium praelongum var. brevius (Nordst.) Willi Krieg. 1935 Not Threatened
Closterium pritchardianum W. Archer 1862 var. pritchardianum Not Threatened
Closterium pritchardianum var. angustum Borzęcki 1920 Not Threatened
Closterium pronum Bréb. 1856 Not Threatened
Closterium pseudocostatum Šťastný & Kouwets 2012 Data Deficient
Closterium pseudolunula Borge 1909 Threatened
Closterium pusillum Hantzsch 1861 var. pusillum Threatened
Closterium pusillum var. laticeps Grönblad 1942 Data Deficient
Closterium pusillum var. monolithum Wittr. 1886 Data Deficient
Closterium pygmaeum Gutw. 1890 Data Deficient
Closterium ralfsii Ralfs 1848 var. ralfsii Highly Threatened
Closterium ralfsii var. gracilius (Maskell) Willi Krieg. 1935 Highly Threatened
Closterium ralfsii var. hybridum Rabenh. 1863 Highly Threatened
Closterium regulare Bréb. 1856 Data Deficient
Closterium rostratum Ralfs 1848 var. rostratum Threatened
Closterium rostratum var. brevirostratum West 1889 Threatened
Closterium setaceum Ralfs 1848 Threatened
Closterium strigosum Bréb. 1856 var. strigosum Not Threatened
Closterium strigosum var. elegans (G.S. West) Willi Krieg. 1935 Not Threatened
Closterium striolatum Ralfs 1848 var. striolatum Threatened
Closterium striolatum var. erectum G.A. Klebs 1879 Data Deficient
Closterium striolatum var. subtruncatum (West & G.S. West) Willi Krieg. 1935 Data Deficient
Closterium subfusiforme Messik. 1951 Not established
Closterium sublaterale Růžička 1958 Not Threatened
Closterium subscoticum Gutw. 1902 Data Deficient
Closterium subulatum (Kütz.) Bréb. 1856 Data Deficient
Closterium toxon West 1892 Data Deficient
Closterium tumidulum F. Gay 1884 Not Threatened
Closterium tumidum L.N. Johnson 1895 var. tumidum Threatened
Closterium tumidum var. nylandicum Grönblad 1921 Threatened
Closterium turgidum Ralfs 1848 var. turgidum Highly Threatened
Closterium turgidum var. giganteum (Nordst.) De Toni 1889 Highly Threatened
Closterium venus Ralfs 1848 var. venus Near Threatened
Closterium venus var. westii Willi Krieg. 1935 Data Deficient
Cosmarium abbreviatum var. germanicum (Racib.) Willi Krieg. & Gerloff 1969 Data Deficient
Cosmarium abbreviatum var. minus (West & G.S. West) Willi Krieg. & Gerloff 1969 Data Deficient
Cosmarium abbreviatum var. planctonicum West & G.S. West 1905 Data Deficient
Cosmarium adoxum West & G.S. West 1897 Highly Threatened
Cosmarium alpestre J. Roy & Bisset 1894 Highly Threatened
Cosmarium amoenum Ralfs 1848 Threatened
Cosmarium anceps P. Lundell 1871 var. anceps Threatened
Cosmarium anceps var. crispulum (Nordst.) Willi Krieg. & Gerloff 1965 Threatened
Cosmarium angulare L.N. Johnson 1894 Data Deficient
Cosmarium angulosum Bréb. 1856 var. angulosum Threatened
Cosmarium angulosum var. concinnum (Rabenh.) West & G.S. West 1901 Threatened
Cosmarium annulatum (Nägeli) de Bary 1858 Highly Threatened
Cosmarium arctoum Nordst. 1875 Highly Threatened
Cosmarium asphaerosporum var. corribense (West & G.S. West) Willi Krieg. & Gerloff 1969 Data Deficient
Cosmarium asphaerosporum var. strigosum Nordst. 1896 Highly Threatened
Cosmarium asterosporum Coesel 1989 Data Deficient
Cosmarium asymmetricum M.F. Rich 1935 Not established
Cosmarium atomus (Eckert) Willi Krieg. & Gerloff 1969 Data Deficient
Cosmarium berryense Kouwets 1998 Data Deficient
Cosmarium bicardia Reinsch 1875 Not established
Cosmarium binerve P. Lundell 1871 var. binerve Data Deficient
Cosmarium binerve var. latum Willi Krieg. & Gerloff 1969 Data Deficient
Cosmarium binum Nordst. 1880 Highly Threatened
Cosmarium bioculatum Ralfs 1848 var. bioculatum Not Threatened
Cosmarium bioculatum var. depressum (Schaarschm.) Schmidle 1894 Highly Threatened
Cosmarium bioculatum var. hians West & G.S. West 1897 Data Deficient
Cosmarium bipunctatum f. subrectangulare West & G.S. West 1908 Data Deficient
Cosmarium biretum Ralfs 1848 subsp. biretum Not Threatened
Cosmarium biretum subsp. trigibberum Nordst. 1875 Data Deficient
Cosmarium blyttii var. bipunctatum (J. Dick) Růžička 1972 Highly Threatened
Cosmarium blyttii var. novae-sylvae West & G.S. West 1897 Data Deficient
Cosmarium boeckii Wille 1880 Threatened
Cosmarium boitierense Kouwets 1998 Data Deficient
Cosmarium botrytis Ralfs 1848 var. botrytis Near Threatened
Cosmarium botrytis var. gemmiferum (Bréb.) Nordst. 1888 Data Deficient
Cosmarium botrytis var. mediolaeve West 1892 Data Deficient
Cosmarium botrytis var. paxillosporum West & G.S. West 1912 Threatened
Cosmarium botrytis var. subtumidum Wittr. 1872 Data Deficient
Cosmarium botrytis var. tumidum Wolle 1884 Data Deficient
Cosmarium brebissonii Ralfs 1848 Threatened
Cosmarium broomei Ralfs 1848 Data Deficient
Cosmarium caelatum Ralfs 1848 Highly Threatened
Cosmarium calcareum Wittr. 1872 Data Deficient
Cosmarium circulare Reinsch 1867 Data Deficient
Cosmarium clepsydra Nordst. 1869 var. clepsydra Highly Threatened
Cosmarium clepsydra var. dissimile Willi Krieg. & Gerloff 1965 Highly Threatened
Cosmarium commissurale Ralfs 1848 Highly Threatened
Cosmarium connatum Ralfs 1848 Highly Threatened
Cosmarium conspersum Ralfs 1848 var. conspersum Highly Threatened
Cosmarium conspersum var. latum (Bréb.) West & G.S. West 1912 Data Deficient
Cosmarium conspersum var. subrotundatum West 1892 Data Deficient
Cosmarium constrictum Delponte 1877 Highly Threatened
Cosmarium contractum Kirchn. 1878 var. contractum Threatened
Cosmarium contractum var. ellipsoideum (Elfving) West & G.S. West 1902 Data Deficient
Cosmarium contractum var. minutum (Delponte) Coesel 1989 Threatened
Cosmarium contractum var. retusum (West & G.S. West) Willi Krieg. & Gerloff 1962 Data Deficient
Cosmarium contractum var. rotundatum Borge 1925 Data Deficient
Cosmarium corbula Bréb. 1856 Highly Threatened
Cosmarium costatum Nordst. 1875 Highly Threatened
Cosmarium crenatum Ralfs 1848 Threatened
Cosmarium crenulatum (Nägeli) Bréb. 1856 Data Deficient
Cosmarium cucumis Ralfs 1848 var. cucumis Threatened
Cosmarium cucumis var. helveticum Nordst. 1880 Data Deficient
Cosmarium cucumis var. magnum Racib. 1885 Highly Threatened
Cosmarium cyclicum P. Lundell 1871 var. cyclicum Highly Threatened
Cosmarium cyclicum var. nordstedtianum (Reinsch) West & G.S. West 1905 Highly Threatened
Cosmarium cymatium (West & G.S. West) Willi Krieg. & Gerloff 1962 Highly Threatened
Cosmarium cymatopleurum Nordst. 1872 Threatened
Cosmarium davidsonii J. Roy & Bisset 1893 Data Deficient
Cosmarium debaryi W. Archer 1861 Threatened
Cosmarium decedens (Reinsch) Racib. 1898 var. decedens Threatened
Cosmarium decedens var. sinuosum (P. Lundell) Racib. 1889 Data Deficient
Cosmarium delicatissimum Lemmerm. 1898 Threat of Unknown Extent
Cosmarium denboeri Meesters & Coesel 2007 Data Deficient
Cosmarium dentiferum Nordst. 1888 Highly Threatened
Cosmarium depressum (Nägeli) P. Lundell 1871 var. depressum Threatened
Cosmarium depressum var. achondrum (Boldt) West & G.S. West 1905 Data Deficient
Cosmarium depressum var. granulatum W.B. Turner 1892 Data Deficient
Cosmarium depressum var. intermedium (Gutw.) Messik. 1927 Data Deficient
Cosmarium depressum var. minutum (Heimerl) Willi Krieg. & Gerloff 1962 Data Deficient
Cosmarium depressum var. planctonicum Reverdin 1919 Not Threatened
Cosmarium didymoprotupsum West & G.S. West 1908 Data Deficient
Cosmarium difficile Lütkem. 1892 var. difficile Not Threatened
Cosmarium difficile var. interseptum (J. Jacobsen) Grönblad 1942 Data Deficient
Cosmarium difficile var. sublaeve Lütkem. 1892 Data Deficient
Cosmarium difficile var. subreinschii Růžička 1972 Data Deficient
Cosmarium difficiloides Kouwets 2001 Data Deficient
Cosmarium dilatatum Lütkem. 1960 Data Deficient
Cosmarium discrepans Šťastný & Kouwets 2012 Data Deficient
Cosmarium eichlerianum (Grönblad) Messik. 1957 Data Deficient
Cosmarium elegantissimum P. Lundell 1871 Data Deficient
Cosmarium exiguum W. Archer 1864 Highly Threatened
Cosmarium fastidiosum West & G.S. West 1897 Highly Threatened
Cosmarium finlandicum (Grönblad) Prescott 1981 Data Deficient
Cosmarium fontigenum Nordst. 1878 Threatened
Cosmarium formosulum Hoff 1888 var. formosulum Not Threatened
Cosmarium formosulum var. nathorstii (Boldt) West & G.S. West 1908 Data Deficient
Cosmarium furcatospermum West & G.S. West 1894 Highly Threatened
Cosmarium galeritum Nordst. 1869 Highly Threatened
Cosmarium garrolense J. Roy & Bisset 1894 var. garrolense Threatened
Cosmarium garrolense var. subundulatum (Schmidle) Willi Krieg. & Gerloff 1962 Data Deficient
Cosmarium gerstenbergeri P.G. Richt. 1895 Threat of Unknown Extent
Cosmarium gibberulum Lütkem. 1910 Data Deficient
Cosmarium globosum Bulnh. 1861 var. globosum Data Deficient
Cosmarium gonioides var. subturgidum West & G.S. West 1902 Data Deficient
Cosmarium gostyniense (Racib.) Grönblad 1921 Data Deficient
Cosmarium granatoides Schmidle 1894 Highly Threatened
Cosmarium granatum Ralfs 1848 var. granatum Not Threatened
Cosmarium granatum var. alatum (J. Jacobsen) Kurt Först. 1965 Data Deficient
Cosmarium granatum var. concavum Lagerh. 1890 Data Deficient
Cosmarium granatum var. delpontei Gutw. 1891 Data Deficient
Cosmarium granatum var. elongatum Nordst. 1872 Not Threatened
Cosmarium granatum var. nordstedtii Hansg. 1888 Data Deficient
Cosmarium hammeri Reinsch 1867 var. hammeri Highly Threatened
Cosmarium hammeri var. homalodermum (Nordst.) West & G.S. West 1905 Highly Threatened
Cosmarium helcangulare Nordst. 1888 var. helcangulare Data Deficient
Cosmarium helcangulare var. simplex (B. Eichler) Willi Krieg. & Gerloff 1969 Data Deficient
Cosmarium holmiense P. Lundell 1871 var. holmiense Threat of Unknown Extent
Cosmarium holmiense var. constrictum (Gutw.) Willi Krieg. & Gerloff 1965 Threat of Unknown Extent
Cosmarium holmiense var. hibernicum (West) Schmidle 1894 Data Deficient
Cosmarium holmiense var. integrum P. Lundell 1871 Threat of Unknown Extent
Cosmarium hornavanense Gutw. 1909 var. hornavanense Data Deficient
Cosmarium hornavanense var. dubovianum (Lütkem.) Růžička 1949 Data Deficient
Cosmarium hornavanense var. janoviense (Gutw.) Růžička 1949 Data Deficient
Cosmarium humile (F. Gay) Nordst. 1889 var. humile Not Threatened
Cosmarium humile var. danicum (Børgesen) Schmidle 1895 Data Deficient
Cosmarium impressulum Elfving 1881 var. impressulum Not Threatened
Cosmarium impressulum var. cossandeyi Růžička 1972 Data Deficient
Cosmarium impressulum var. suborthogonum (West & G.S. West) Taft 1945 Data Deficient
Cosmarium incertum Schmidle 1895 Data Deficient
Cosmarium inclusum Borge 1930 Data Deficient
Cosmarium infirmum Grönblad 1926 Data Deficient
Cosmarium intermedium Delponte 1877 Data Deficient
Cosmarium isthmium West 1890 Data Deficient
Cosmarium isthmochondrum Nordst. 1873 Data Deficient
Cosmarium jenisejense Boldt 1885 Data Deficient
Cosmarium kirchneri Børgesen 1889 Data Deficient
Cosmarium kjellmanii Wille 1879 Data Deficient
Cosmarium klebsii Gutw. 1892 Data Deficient
Cosmarium laeve Rabenh. 1868 var. laeve Not Threatened
Cosmarium laeve var. octangulare (Wille) West & G.S. West 1908 Data Deficient
Cosmarium latifrons var. borgei Gutw. 1897 Data Deficient
Cosmarium levinotabile Croasdale 1981 Threatened
Cosmarium limnophilum Schmidle 1895 Data Deficient
Cosmarium logiense Bisset 1884 Data Deficient
Cosmarium lundellii Delponte 1877 var. lundellii Highly Threatened
Cosmarium lundellii var. corruptum (W.B. Turner) West & G.S. West 1902 Data Deficient
Cosmarium lutetianum Kouwets 1998 (≡ Cosmarium pygmaeum var. apertum Skuja 1956) Not established
Cosmarium majae K. Strøm 1922 Threatened
Cosmarium mamillomarginatum Grönblad 1942 Data Deficient
Cosmarium margaritatum (P. Lundell) J. Roy & Bisset 1886 Highly Threatened
Cosmarium margaritiferum Ralfs 1848 f. margaritiferum Threatened
Cosmarium margaritiferum f. regularius (Nordst.) West & G.S. West 1908 Data Deficient
Cosmarium medioretusum Coesel 2007 Data Deficient
Cosmarium melanosporum W. Archer 1883 Data Deficient
Cosmarium meneghinii Ralfs 1848 Near Threatened
Cosmarium messikommeri Coesel 1989 Data Deficient
Cosmarium microsphinctum Nordst. 1876 Highly Threatened
Cosmarium moniliforme Ralfs 1848 var. moniliforme Highly Threatened
Cosmarium moniliforme var. ellipticum (Lagerh.) Willi Krieg. & Gerloff 1969 Data Deficient
Cosmarium moniliforme var. panduriforme (Heimerl) Schmidle 1895 Highly Threatened
Cosmarium moniliforme var. subpyriforme West & G.S. West 1908 Data Deficient
Cosmarium monomazum var. polymazum Nordst. 1873 Highly Threatened
Cosmarium naegelianum Bréb. ex W. Archer 1861 Data Deficient
Cosmarium nasutum Nordst. 1872 Data Deficient
Cosmarium nitidulum De Not. 1867 Highly Threatened
Cosmarium norimbergense Reinsch 1867 var. norimbergense Highly Threatened
Cosmarium norimbergense var. depressum (West & G.S. West) Willi Krieg. & Gerloff 1969 Highly Threatened
Cosmarium norimbergense var. elongatum (West & G.S. West) Willi Krieg. & Gerloff 1969 Data Deficient
Cosmarium notabile Bréb. 1856 var. notabile Data Deficient
Cosmarium notabile var. subnotabile (Wille) Coesel 2007 Data Deficient
Cosmarium novae-semliae Wille 1879 var. novae-semliae Data Deficient
Cosmarium novae-semliae var. sibiricum Boldt 1885 Data Deficient
Cosmarium nymannianum Grunow 1868 var. nymannianum Highly Threatened
Cosmarium nymannianum var. brevius (Wille) Willi Krieg. & Gerloff 1962 Data Deficient
Cosmarium nymannianum var. elongatum Racib. 1889 Data Deficient
Cosmarium obliquum Nordst. 1873 Highly Threatened
Cosmarium obsoletum (Hantzsch) Reinsch 1867 Threatened
Cosmarium obtusatum (Schmidle) Schmidle 1898 Not Threatened
Cosmarium ocellatum B. Eichler & Gutw. 1894 Highly Threatened
Cosmarium ochthodes Nordst. 1875 var. ochthodes Threatened
Cosmarium ochthodes var. amoebum West 1892 Data Deficient
Cosmarium orbiculatum Ralfs 1848 Data Deficient
Cosmarium ornatulum Coesel 2002 var. ornatulum Data Deficient
Cosmarium ornatulum var. depressum Coesel 2002 Data Deficient
Cosmarium ornatum Ralfs 1848 Highly Threatened
Cosmarium orthostichum P. Lundell 1871 var. orthostichum Highly Threatened
Cosmarium orthostichum var. pumilum P. Lundell 1871 Data Deficient
Cosmarium otus Willi Krieg. 1932 Data Deficient
Cosmarium ovale Ralfs 1848 Threatened
Cosmarium pachydermum P. Lundell 1871 var. pachydermum Threatened
Cosmarium pachydermum var. aethiopicum (West & G.S. West) West & G.S. West 1905 Threatened
Cosmarium pachydermum var. hexagonum Gutw. 1890 Data Deficient
Cosmarium pachydermum var. indicum Lyengar & Vimala Bai 1941 Data Deficient
Cosmarium pachydermum var. minus Nordst. 1873 Data Deficient
Cosmarium paragranatoides Skuja 1930 Data Deficient
Cosmarium parvulum Bréb. 1856 Highly Threatened
Cosmarium perforatum P. Lundell 1871 var. perforatum Highly Threatened
Cosmarium perforatum var. rauchii F. Ducel. 1918 Highly Threatened
Cosmarium pericymaticum Nordst. 1875 Highly Threatened
Cosmarium perpusillum West 1892 Data Deficient
Cosmarium phaseolus Ralfs 1848 var. phaseolus Highly Threatened
Cosmarium phaseolus var. elevatum Nordst. 1873 Highly Threatened
Cosmarium phaseolus var. notatum (Nordst.) Coesel 1991 Highly Threatened
Cosmarium phaseolus var. omphalum (Schaarschm.) Racib. 1889 Highly Threatened
Cosmarium plicatum Reinsch 1867 Threatened
Cosmarium pluviale W. Archer 1861 Data Deficient
Cosmarium polygonatum Halász 1940 Data Deficient
Cosmarium polygonum (Nägeli) W. Archer 1861 var. polygonum Threatened
Cosmarium polygonum var. depressum Messik. 1942 Threatened
Cosmarium portianum W. Archer 1860 Not Threatened
Cosmarium praecisum var. suecicum (Borge) Willi Krieg. & Gerloff 1962 Data Deficient
Cosmarium praemorsum Bréb. 1856 Highly Threatened
Cosmarium prominens var. ellipticum Willi Krieg. & Gerloff 1965 Data Deficient
Cosmarium prominulum Racib. 1885 var. prominulum Highly Threatened
Cosmarium prominulum var. subundulatum West & G.S. West 1894 Highly Threatened
Cosmarium protractum (Nägeli) de Bary 1858 Threatened
Cosmarium protuberans P. Lundell 1871 Highly Threatened
Cosmarium pseudarctoum Nordst. 1879 Highly Threatened
Cosmarium pseudoamoenum Wille 1884 Threatened
Cosmarium pseudoconnatum Nordst. 1869 Threatened
Cosmarium pseudoconnatum var. ellipsoideum West & G.S. West 1902 Not established
Cosmarium pseudoexiguum Racib. 1885 Highly Threatened
Cosmarium pseudonitidulum Nordst. 1873 var. pseudonitidulum Highly Threatened
Cosmarium pseudonitidulum var. validum West & G.S. West 1905 Highly Threatened
Cosmarium pseudoornatum B. Eichler & Gutw. 1894 Data Deficient
Cosmarium pseudoprotuberans Kirchn. 1878 var. pseudoprotuberans Highly Threatened
Cosmarium pseudoprotuberans var. alpinum Racib. 1885 Highly Threatened
Cosmarium pseudoprotuberans var. saxonicum (Racib.) Willi Krieg. & Gerloff 1965 Data Deficient
Cosmarium pseudopyramidatum P. Lundell 1871 var. pseudopyramidatum Threatened
Cosmarium pseudopyramidatum var. ansatum (Rabenh.) Willi Krieg. & Gerloff 1965 Data Deficient
Cosmarium pseudopyramidatum var. extensum (Nordst.) Willi Krieg. & Gerloff 1965 Data Deficient
Cosmarium pseudopyramidatum var. stenonotum Nordst. 1876 Data Deficient
Cosmarium pseudoretusum F. Ducell. 1918 var. pseudoretusum Highly Threatened
Cosmarium pseudoretusum var. inaequalipellicum (West & G.S. West) Willi Krieg. & Gerloff 1962 Data Deficient
Cosmarium pseudowembaerense Kouwets 1998 Data Deficient
Cosmarium punctulatum Bréb. 1856 var. punctulatum Threatened
Cosmarium punctulatum var. minor Oye & Cornil 1941 Data Deficient
Cosmarium punctulatum var. subpunctulatum (Nordst.) Børgesen 1894 Threatened
Cosmarium pusillum (Bréb.) W. Archer 1861 Highly Threatened
Cosmarium pygmaeum W. Archer 1864 var. pygmaeum Threatened
Cosmarium pygmaeum var. atumidum Grönblad 1921 Data Deficient
Cosmarium pygmaeum var. heimerlii (West & G.S. West) Willi Krieg. & Gerloff 1965 Data Deficient
Cosmarium pyramidatum Ralfs 1848 var. pyramidatum Threatened
Cosmarium pyramidatum var. angustatum West & G.S. West 1894 Threatened
Cosmarium quadratulum (F. Gay) De Toni 1889 var. quadratulum Threatened
Cosmarium quadratulum var. applanatum Insam & Willi Krieg. 1936 Data Deficient
Cosmarium quadratulum var. boldtii (Messik.) Willi Krieg. & Gerloff 1962 Data Deficient
Cosmarium quadratulum var. subimpressulum (J. Dick) Willi Krieg. & Gerloff 1965 Data Deficient
Cosmarium quadratum Ralfs 1848 f. quadratum Threatened
Cosmarium quadratum f. willei West & G.S. West 1908 Threatened
Cosmarium quadrifarium P. Lundell 1871 var. quadrifarium Highly Threatened
Cosmarium quadrifarium var. hexastichum (P. Lundell) Kurt Först. 1981 Highly Threatened
Cosmarium quadrum P. Lundell 1871 var. quadrum Highly Threatened
Cosmarium quadrum var. minus Nordst. 1873 Data Deficient
Cosmarium quasillus P. Lundell 1871 Highly Threatened
Cosmarium quinarium P. Lundell 1871 Highly Threatened
Cosmarium raciborskii (Racib.) Lagerh. 1887 Highly Threatened
Cosmarium ralfsii Ralfs 1848 var. ralfsii Highly Threatened
Cosmarium ralfsii var. montanum Racib. 1885 Highly Threatened
Cosmarium rectangulare Grunow 1868 var. rectangulare Threatened
Cosmarium rectangulare var. hexagonum (Elfving) West & G.S. West 1908 Threatened
Cosmarium rectangulare var. quadrigemminatum Playfair 1908 Threatened
Cosmarium rectangulum Reinsch 1875 Data Deficient
Cosmarium regnellii Wille 1884 var. regnellii Threatened
Cosmarium regnellii var. kerguelense Will Krieg. & Gerloff 1969 Data Deficient
Cosmarium regnellii var. minimum B. Eichler & Gutw. 1894 Threatened
Cosmarium regnellii var. pseudoregnellii (Messik.) Willi Krieg. & Gerloff 1969 Data Deficient
Cosmarium regnesii Reinsch 1867 var. regnesii Highly Threatened
Cosmarium regnesii var. polonicum (B. Eichler & Gutw.) Compère 1976 Data Deficient
Cosmarium regulare Schmidle 1894 Threatened
Cosmarium reinschii W. Archer 1876 Threatened
Cosmarium reniforme (Ralfs) W. Archer 1874 var. reniforme Not Threatened
Cosmarium reniforme var. apertum West & G.S. West 1908 Data Deficient
Cosmarium reniforme var. compressum Nordst. 1887 Data Deficient
Cosmarium repandum var. minus Willi Krieg. & Gerloff 1962 Data Deficient
Cosmarium retusiforme (Wille) Gutw. 1890 Highly Threatened
Cosmarium retusum (Perty) Rabenh. 1868 Data Deficient
Cosmarium rupestre (Nägeli) W. Archer 1861 Threat of Unknown Extent
Cosmarium schmidtianum Kurt Först. 1965 Data Deficient
Cosmarium scopulorum Borge 1923 Data Deficient
Cosmarium sendtnerianum (Reinsch) Wolle 1885 Data Deficient
Cosmarium sexangulare P. Lundell 1871 var. sexangulare Highly Threatened
Cosmarium sexangulare var. minus J. Roy & Bisset 1886 Highly Threatened
Cosmarium sexnotatum Gutw. 1892 var. sexnotatum Highly Threatened
Cosmarium sexnotatum var. tristriatum (Lütkem.) Schmidle 1895 Highly Threatened
Cosmarium simplicius (West & G.S. West) Grönblad 1931 Data Deficient
Cosmarium sinostegos Schaarschm. 1883 var. sinostegos Highly Threatened
Cosmarium sinostegos var. obtusius Gutw. 1892 Highly Threatened
Cosmarium sparsepunctatum (Schmidle) Willi Krieg. & Gerloff 1969 Data Deficient
Cosmarium speciosum f. americanum (West & G.S. West) West & G.S. West 1908 Data Deficient
Cosmarium speciosum var. simplex Nordst. 1872 Threatened
Cosmarium sphagnicolum West & G.S. West 1897 var. sphagnicolum Threatened
Cosmarium sphagnicolum var. armatum Willi Krieg. & Gerloff 1965 Data Deficient
Cosmarium sphyrelatum Coesel 1989 Data Deficient
Cosmarium sportella Kütz. 1849 var. sportella Data Deficient
Cosmarium sportella var. subnudum West & G.S. West 1908 Threatened
Cosmarium striolatum (Nägeli) W. Archer 1861 Data Deficient
Cosmarium subarctoum (Lagerh.) Racib. 1892 Data Deficient
Cosmarium subbireme Gutw. 1902 Data Deficient
Cosmarium subbroomei Schmidle 1893 f. subbroomei Threatened
Cosmarium subbroomei f. isthmochondrum Coesel 1989 Data Deficient
Cosmarium subcontractum West & G.S. West 1905 Data Deficient
Cosmarium subcostatum Nordst. 1876 var. subcostatum Near Threatened
Cosmarium subcostatum var. beckii (Gutw.) West & G.S. West 1908 Threatened
Cosmarium subcostatum var. minus (West & G.S. West) Kurt Först. 1982 Threatened
Cosmarium subcrenatum Hantzsch 1861 Threatened
Cosmarium subcucumis Schmidle 1893 var. subcucumis Threatened
Cosmarium subcucumis var. trigonum Willi Krieg. & Gerloff 1969 Data Deficient
Cosmarium subgranatum (Nordst.) Lütkem. 1902 var. subgranatum Threatened
Cosmarium subgranatum var. borgei Willi Krieg. 1944 Data Deficient
Cosmarium subpachydermum Schmidle 1893 Data Deficient
Cosmarium subprotumidum Nordst. 1876 var. subprotumidum Threatened
Cosmarium subprotumidum var. gregorii (J. Roy & Bisset) West & G.S. West 1900 Data Deficient
Cosmarium subprotumidum var. pyramidale Coesel 1989 Data Deficient
Cosmarium subquadrans West & G.S. West 1905 Data Deficient
Cosmarium subquadratum Nordst. 1876 var. subquadratum Threatened
Cosmarium subquadratum var. plicatiforme Willi Krieg. & Gerloff 1969 Data Deficient
Cosmarium subreinschii Schmidle 1894 Threatened
Cosmarium subreniforme Nordst. 1875 Data Deficient
Cosmarium subspeciosum Nordst. 1875 var. subspeciosum Threatened
Cosmarium subspeciosum var. transiens Messik. 1942 Data Deficient
Cosmarium subspeciosum var. validius Nordst. 1887 Threatened
Cosmarium subtumidum Nordst. 1878 var. subtumidum Threatened
Cosmarium subtumidum var. groenbladii Croasdale 1964 Data Deficient
Cosmarium subturpinii Borge 1921 Data Deficient
Cosmarium subundulatum Wille 1880 Data Deficient
Cosmarium synthlibomenum West 1892 Data Deficient
Cosmarium tatricum Racib. 1885 Highly Threatened
Cosmarium taxichondriforme B. Eichler & Gutw. 1894 Highly Threatened
Cosmarium tenue W. Archer 1868 var. tenue Data Deficient
Cosmarium tenue var. strusoviense (Gutw.) Willi Krieg. & Gerloff 1962 Data Deficient
Cosmarium tetrachondrum P. Lundell 1871 Highly Threatened
Cosmarium tetragonum (Nägeli) W. Archer 1861 var. tetragonum Threatened
Cosmarium tetragonum f. lundellii Cooke 1887 Threatened
Cosmarium tetragonum f. minus Croasdale 1956 Data Deficient
Cosmarium tetragonum var. bipapillatum (B. Eichler) Willi Krieg. & Gerloff 1965 Data Deficient
Cosmarium tetragonum var. ornatum Willi Krieg. & Gerloff 1965 Data Deficient
Cosmarium tetraophthalmum Ralfs 1848 Threatened
Cosmarium thwaitesii Ralfs 1848 var. thwaitesii Highly Threatened
Cosmarium thwaitesii var. penioides G.A. Klebs 1879 Highly Threatened
Cosmarium thwaitesii var. rotundatum G.A. Klebs 1879 Data Deficient
Cosmarium tinctum Ralfs 1848 var. tinctum Threatened
Cosmarium tinctum var. intermedium Nordst. 1887 Data Deficient
Cosmarium tinctum var. subretusum Messik. 1942 Data Deficient
Cosmarium trachypleurum var. minus Racib. 1884 Data Deficient
Cosmarium trachypleurum var. subnudum G.S. West 1909 Data Deficient
Cosmarium transitorium (Heimerl) F. Ducell. 1918 Threatened
Cosmarium trilobulatum Reinsch 1867 var. trilobulatum Highly Threatened
Cosmarium trilobulatum var. maius (Wittr.) Willi Krieg. & Gerloff 1962 Data Deficient
Cosmarium trilobulatum var. minus (Wille) Willi Krieg. & Gerloff 1962 Data Deficient
Cosmarium truncatellum (Perty) Rabenh. 1868 Highly Threatened
Cosmarium tuddalense K. Strøm 1920 Highly Threatened
Cosmarium tumens Nords. 1872 Highly Threatened
Cosmarium tumidum P. Lundell 1871 Threatened
Cosmarium turpinii Bréb. 1856 var. turpinii Threatened
Cosmarium turpinii var. podolicum Gutw. 1890 Data Deficient
Cosmarium tyrolicum (Nordst.) Willi Krieg. & Gerloff 1962 var. tyrolicum Data Deficient
Cosmarium tyrolicum var. beanlandii (West & G.S. West) Willi Krieg. & Gerloff 1962 Data Deficient
Cosmarium umbilicatum Lütkem. 1892 Highly Threatened
Cosmarium undulatum Ralfs 1848 var. undulatum Threatened
Cosmarium undulatum var. minutum Wittr. 1869 Threatened
Cosmarium undulatum var. wollei West 1892 Threatened
Cosmarium ungerianum (Nägeli) de Bary 1858 var. ungerianum Highly Threatened
Cosmarium ungerianum var. bohemicum Lütkem. 1910 Data Deficient
Cosmarium ungerianum var. nodosum (O.F. Andersson) Lütkem. 1910 Highly Threatened
Cosmarium ungerianum var. subtriplicatum West & G.S. West 1897 Threat of Unknown Extent
Cosmarium variolatum P. Lundell 1871 var. variolatum Threatened
Cosmarium variolatum var. cataractarum Racib. 1889 Threatened
Cosmarium varsoviense Racib. 1889 Highly Threatened
Cosmarium venustum (Bréb.) W. Archer 1861 var. venustum Threatened
Cosmarium venustum var. excavatum (B. Eichler & Gutw.) West & G.S. West 1895 Threatened
Cosmarium venustum var. induratum Nordst. 1887 Data Deficient
Cosmarium venustum var. minus (Wille) Willi Krieg. & Gerloff 1965 Data Deficient
Cosmarium vexatum West 1892 var. vexatum Threatened
Cosmarium vexatum var. concavum Schmidle 1893 Data Deficient
Cosmarium vexatum var. lacustre Messik. 1935 Data Deficient
Cosmarium wembaerense Schmidle 1898 Data Deficient
Cosmarium wittrockii P. Lundell 1871 Highly Threatened
Cosmarium zonatum P. Lundell 1871 Highly Threatened
Cosmocladium constrictum (W. Archer) W. Archer 1875 Highly Threatened
Cosmocladium perissum J. Roy & Bisset 1894 Data Deficient
Cosmocladium pulchellum Bréb. 1856 Threat of Unknown Extent
Cosmocladium saxonicum de Bary 1865 Extremely Rare
Cylindrocystis brebissonii (Ralfs) de Bary 1858 var. brebissonii Threatened
Cylindrocystis brebissonii var. curvata Rabanus 1923 Data Deficient
Cylindrocystis brebissonii var. minor West & G.S. West 1902 Data Deficient
Cylindrocystis brebissonii var. turgida Schmidle 1895 Data Deficient
Cylindrocystis crassa de Bary 1858 Highly Threatened
Cylindrocystis gracilis I. Hirn 1953 Data Deficient
Cylindrocystis jenneri (Ralfs) West & G.S. West 1904 Data Deficient
D
Desmidium aptogonum Kütz. 1849 var. aptogonum Not Threatened
Desmidium aptogonum var. acutius Nordst. 1878 Threatened
Desmidium aptogonum var. ehrenbergii Kütz. 1849 Extremely Rare
Desmidium baileyi (Ralfs) Nordst. 1880 var. baileyi Not Threatened
Desmidium baileyi f. tetragona Nordst. 1888 Data Deficient
Desmidium coarctatum Nordst. 1888 Threatened
Desmidium cylindricum Nordst. 1873 Extremely Rare
Desmidium grevillii (Ralfs) de Bary 1858 Not Threatened
Desmidium laticeps Nordst. 1880 Not Threatened
Desmidium pseudostreptonema West & G.S. West 1902 Threatened
Desmidium quadratum Nordst. 1873 Threatened
Desmidium swartzii Ralfs 1848 var. swartzii Not Threatened
Desmidium swartzii var. quadrangulatum (Ralfs) J. Roy & Bisset 1894 Extremely Rare
Docidium baculum Ralfs 1848 Highly Threatened
Docidium nobile (P.G. Richt.) P. Lundell 1871 Extremely Rare
E
Euastrum aboense Elfv. 1881 Threatened
Euastrum ampullaceum Ralfs 1848 Highly Threatened
Euastrum ansatum Ralfs 1848 var. ansatum Threatened
Euastrum ansatum var. concavum Willi Krieg. 1937 Threatened
Euastrum ansatum var. pyxidatum Delponte 1873 Threatened
Euastrum ansatum var. rhomboidale F. Ducell. 1918 Data Deficient
Euastrum bidentatum Nägeli 1849 var. bidentatum Threatened
Euastrum bidentatum var. oculatum (Istv.) Willi Krieg. 1937 Data Deficient
Euastrum bidentatum var. speciosum (Boldt) Schmidle 1898 Threatened
Euastrum bilobum Lütkem. 1893 Data Deficient
Euastrum binale Ralfs 1848 var. binale Threatened
Euastrum binale var. gutwinskii (Schmidle) Homfeld 1929 Threatened
Euastrum binale var. hians (West) Willi Krieg. 1937 Data Deficient
Euastrum binale var. sectum (W.B. Turner) Willi Krieg. 1937 Data Deficient
Euastrum boldtii Schmidle 1895 Data Deficient
Euastrum crassangulatum Børgesen 1891 Data Deficient
Euastrum crassicolle P. Lundell 1871 Threatened
Euastrum crassum Ralfs 1848 var. crassum Threatened
Euastrum crassum var. microcephalum Willi Krieg. 1937 Threatened
Euastrum crispulum (Nordst.) West & G.S. West 1905 Highly Threatened
Euastrum cuneatum Ralfs 1848 Threatened
Euastrum denticulatum F. Gay 1884 Threatened
Euastrum didelta Ralfs 1848 Threatened
Euastrum divaricatum P. Lundell 1871 Highly Threatened
Euastrum dubium Nägeli 1849 var. dubium Threatened
Euastrum dubium var. ornatum Wołosz. 1922 Data Deficient
Euastrum elegans Ralfs 1848 var. elegans Threatened
Euastrum elegans var. novae-semliae (Wille) De Toni 1889 Highly Threatened
Euastrum elegans var. ornatum West 1892 Highly Threatened
Euastrum erosum P. Lundell 1871 Highly Threatened
Euastrum gayanum De Toni 1889 Threatened
Euastrum gemmatum Ralfs 1848 Highly Threatened
Euastrum germanicum (Schmidle) Willi Krieg. 1937 Highly Threatened
Euastrum humerosum Ralfs 1848 var. humerosum Highly Threatened
Euastrum humerosum var. affine (Ralfs) G.C. Wall. 1860 Highly Threatened
Euastrum inerme (Ralfs) P. Lundell 1871 Extremely Rare
Euastrum insigne Ralfs 1848 var. insigne Highly Threatened
Euastrum insigne var. pulchrum Willi Krieg. 1937 Data Deficient
Euastrum insulare (Wittr.) J. Roy 1883 var. insulare Threatened
Euastrum insulare var. lacustre (Messik.) Willi Krieg. 1937 Data Deficient
Euastrum intermedium Cleve 1864 Highly Threatened
Euastrum luetkemuelleri F. Ducell. 1918 var. luetkemuelleri Threat of Unknown Extent
Euastrum luetkemuelleri var. carniolicum (Lütkem.) Willi Krieg. 1937 Data Deficient
Euastrum montanum West & G.S. West 1905 Highly Threatened
Euastrum oblongum Ralfs 1848 Threatened
Euastrum pectinatum Ralfs 1848 var. pectinatum Threatened
Euastrum pectinatum var. brachylobum Wittr. 1872 Highly Threatened
Euastrum pinnatum Ralfs 1848 Highly Threatened
Euastrum platycerum Reinsch 1875 Extremely Rare
Euastrum pseudoboldtii Grönblad 1921 Highly Threatened
Euastrum pulchellum Bréb. 1856 Threatened
Euastrum sibiricum Boldt 1885 var. sibiricum Extremely Rare
Euastrum sibiricum var. exsectum (Grönblad) Willi Krieg. 1937 Data Deficient
Euastrum sinuosum W. Archer 1861 var. sinuosum Highly Threatened
Euastrum sinuosum var. germanicum (Racib.) Willi Krieg. 1937 Data Deficient
Euastrum sinuosum var. scrobiculatum (Nordst.) Willi Krieg. 1937 Data Deficient
Euastrum spinulosum Delponte 1877 Highly Threatened
Euastrum subalpinum Messik. 1935 var. subalpinum Highly Threatened
Euastrum subalpinum var. crassum Messik. 1942 Threat of Unknown Extent
Euastrum sublobatum Ralfs 1848 var. sublobatum Highly Threatened
Euastrum sublobatum var. dissimile (Nordst.) West & G.S. West 1905 Highly Threatened
Euastrum turneri West 1892 var. turneri Threatened
Euastrum turneri var. bohemicum (Lütkem.) Willi Krieg. 1937 Highly Threatened
Euastrum validum West & G.S. West 1896 Highly Threatened
Euastrum ventricosum P. Lundell 1871 Highly Threatened
Euastrum verrucosum Ralfs 1848 var. verrucosum Threatened
Euastrum verrucosum var. alatum Wolle 1884 Threatened
Euastrum verrucosum var. rhomboideum P. Lundell 1871 Highly Threatened
G
Genicularia elegans West & G.S. West 1903 Extremely Rare
Genicularia spirotaenia (de Bary) de Bary 1858 Extremely Rare
Gonatozygon aculeatum W.N. Hastings 1892 Data Deficient
Gonatozygon brebissonii de Bary 1858 Highly Threatened
Gonatozygon kinahanii (W. Archer) Rabenh. 1868 Threatened
Gonatozygon monotaenium de Bary 1856 Highly Threatened
Groenbladia neglecta (Racib.) Teiling 1952 Threatened
Groenbladia undulata (Nordst.) Kurt Först. 1972 Data Deficient
H
Heimansia pusilla (Hilse) Coesel 1993 Highly Threatened
Hyalotheca dissiliens Ralfs 1848 var. dissiliens Not Threatened
Hyalotheca dissiliens var. hians Wolle 1887 Threatened
Hyalotheca dissiliens var. minor Delponte 1876 Data Deficient
Hyalotheca dissiliens var. tatrica Racib. 1895 Threatened
Hyalotheca mucosa Ralfs 1848 Not Threatened
M
Mesotaenium amaliae Schmidle 1899 Data Deficient
Mesotaenium caldariorum (Lagerh.) Hansg. 1886 Threatened
Mesotaenium chlamydosporum de Bary 1858 Threatened
Mesotaenium degreyi W.B. Turner 1886 var. degreyi Highly Threatened
Mesotaenium degreyi var. breve West 1892 Highly Threatened
Mesotaenium endlicherianum Nägeli 1849 var. endlicherianum Threatened
Mesotaenium endlicherianum var. grande Nordst. 1879 Threatened
Mesotaenium macrococcum (Kütz.) J. Roy & Bisset 1894 var. macrococcum Threatened
Mesotaenium macrococcum var. minus (de Bary) Compère 1966 Threatened
Mesotaenium mirificum W. Archer 1864 Data Deficient
Micrasterias americana Ralfs 1848 var. americana Threatened
Micrasterias americana var. boldtii Gutw. 1890 Threatened
Micrasterias apiculata Ralfs 1848 Highly Threatened
Micrasterias brachyptera P. Lundell 1871 var. brachyptera Threatened
Micrasterias brachyptera var. glabriuscula (Nordst.) Willi Krieg. 1939 Data Deficient
Micrasterias conferta P. Lundell 1871 Highly Threatened
Micrasterias crux-melitensis Ralfs 1848 var. crux-melitensis Threatened
Micrasterias crux-melitensis var. janeira (Racib.) Grönblad 1920 Data Deficient
Micrasterias decemdentata (Nägeli) W. Archer 1861 Highly Threatened
Micrasterias denticulata Ralfs 1848 var. denticulata Threatened
Micrasterias denticulata var. angulosa (Hantzsch) West & G.S. West 1902 Threatened
Micrasterias denticulata var. intermedia Nordst. 1880 Data Deficient
Micrasterias fimbriata Ralfs 1848 Highly Threatened
Micrasterias furcata Ralfs 1848 Highly Threatened
Micrasterias jenneri Ralfs 1848 Highly Threatened
Micrasterias mahabuleshwarensis J. Hobson 1863 var. mahabuleshwarensis Highly Threatened
Micrasterias mahabuleshwarensis var. wallichii (Grunow) West & G.S. West 1905 Extremely Rare
Micrasterias oscitans Ralfs 1848 var. oscitans Highly Threatened
Micrasterias oscitans var. mucronata (R.V. Dixon) Wille 1881 Data Deficient
Micrasterias papillifera Ralfs 1848 var. papillifera Threatened
Micrasterias papillifera var. glabra Nordst. 1882 Threatened
Micrasterias papillifera var. mucronata (J. Dick) Willi Krieg. 1939 Data Deficient
Micrasterias papillifera var. pseudomurrayi Laporte 1931 Data Deficient
Micrasterias pinnatifida Ralfs 1848 var. pinnatifida Threatened
Micrasterias pinnatifida var. pseudoscitans Grönblad 1920 Data Deficient
Micrasterias radiosa Ralfs 1848 Highly Threatened
Micrasterias rotata Ralfs 1848 var. rotata Threatened
Micrasterias thomasiana W. Archer 1862 var. thomasiana Highly Threatened
Micrasterias thomasiana var. notata (Nordst.) Grönblad 1920 Threatened
Micrasterias truncata Ralfs 1848 var. truncata Threatened
Micrasterias truncata var. bahusiensis Wittr. 1869 Threat of Unknown Extent
Micrasterias truncata var. crenata (Ralfs) Grönblad 1920 Highly Threatened
Micrasterias truncata var. quadrata Bulnh. 1859 Extremely Rare
Micrasterias truncata var. semiradiata (Nägeli) Wolle 1884 Threatened
Micrasterias verrucosa Bisset 1885 Extremely Rare
N
Netrium digitus (Ralfs) Itzigs. & Rothe ex Rabanus 1856 var. digitus Threatened
Netrium digitus var. lamellosum (Kütz.) Grönblad 1920 Threatened
Netrium digitus var. latum Hust. 1911 Highly Threatened
Netrium digitus var. naegelii (Bréb.) Willi Krieg. 1937 Threat of Unknown Extent
Netrium digitus var. rhomboideum Grönblad 1920 Threat of Unknown Extent
Netrium oblongum (de Bary) Lütkem. 1902 Highly Threatened
Netrium pseudactinotaenium Coesel 2002 Data Deficient
Nucleotaenium cylindricum A.A. Gontsch. & Melkonian Data Deficient
Nucleotaenium eifelense A.A. Gontsch. & Melkonian Data Deficient
O
Oocardium stratum Nägeli 1849 Threatened with Extinction
P
Penium cylindrus Ralfs 1848 Threatened
Penium exiguum West 1892 Highly Threatened
Penium margaritaceum Ralfs 1848 Highly Threatened
Penium polymorphum (Perty) Perty 1852 Threatened
Penium spirostriolatum J. Barker 1869 Threatened
Planotaenium interruptum (Ralfs) Petlovany & Pal.-Mordv. 2009 var. interruptum Highly Threatened
Planotaenium interruptum var. minor (Ralfs) Petlovany & Pal.-Mordv. 2009 (≡ Penium interruptum var. minus Ralfs, Netrium interruptum var. minus (Borge) Willi Krieg.) Not established
Planotaenium ohtanii A.A. Gontsch. & Melkonian 2010 Data Deficient
Pleurotaenium archeri Delponte 1877 Data Deficient
Pleurotaenium clavatum (Kütz.) de Bary 1858 Threat of Unknown Extent
Pleurotaenium coronatum (Bréb.) Rabenh. 1868 var. coronatum Threatened
Pleurotaenium coronatum var. fluctuatum West 1892 Extremely Rare
Pleurotaenium cosmarioides de Bary 1858 Threat of Unknown Extent
Pleurotaenium crenulatum (Ralfs) Rabenh. 1868 Threatened
Pleurotaenium ehrenbergii (Ralfs) de Bary 1858 var. ehrenbergii Threatened
Pleurotaenium ehrenbergii var. elongatum (West) West 1892 Highly Threatened
Pleurotaenium ehrenbergii var. undulatum Schaarschm. 1883 Highly Threatened
Pleurotaenium eugeneum (W.B. Turner) West & G.S. West 1904 Highly Threatened
Pleurotaenium excelsum var. borgei (West & G.S. West) Bando 1988 Data Deficient
Pleurotaenium maximum (Reinsch) P. Lundell 1871 Data Deficient
Pleurotaenium minutum (Ralfs) Hilse 1866 var. minutum Threatened
Pleurotaenium minutum var. alpinum (Racib.) Gutw. 1909 Highly Threatened
Pleurotaenium minutum var. crassum (West) Willi Krieg. 1932 Highly Threatened
Pleurotaenium minutum var. elongatum (West & G.S. West) Cedergr. 1932 Highly Threatened
Pleurotaenium minutum var. gracile (Wille) Willi Krieg. 1932 Highly Threatened
Pleurotaenium minutum var. latum Kaiser 1931 Highly Threatened
Pleurotaenium nodosum (Bailey) P. Lundell 1871 Highly Threatened
Pleurotaenium nodulosum (Ralfs) de Bary 1858 Extremely Rare
Pleurotaenium rectum Delponte 1878 Highly Threatened
Pleurotaenium simplicissimum Grönblad 1920 Extremely Rare
Pleurotaenium trabecula Nägeli 1849 var. trabecula Near Threatened
Pleurotaenium trabecula var. crassum Wittr. 1872 Threatened
Pleurotaenium trabecula var. elongatum Cedergr. 1913 Threatened
Pleurotaenium tridentulum (Wolle) West 1892 Highly Threatened
Pleurotaenium truncatum (Ralfs) Nägeli 1849 var. truncatum Threatened
Pleurotaenium truncatum var. crassum Boldt 1885 Extremely Rare
Pleurotaenium truncatum var. farquharsonii (J. Roy) West & G.S. West 1904 Extremely Rare
R
Roya closterioides Coesel 2007 Data Deficient
Roya obtusa (Bréb.) West & G.S. West 1896 var. obtusa Extremely Rare
Roya obtusa var. anglica (G.S. West) Willi Krieg. 1937 Extremely Rare
Roya obtusa var. montana West & G.S.West Data Deficient
S
Sphaerozosma aubertianum West 1889 var. aubertianum Threatened
Sphaerozosma aubertianum var. archeri (Gutw.) West & G.S. West 1969 Data Deficient
Sphaerozosma filiforme Ralfs 1848 Not Threatened
Sphaerozosma laeve (Nordst.) Thomasson 1966 Not Threatened
Sphaerozosma vertebratum Ralfs 1848 Not Threatened
Spirotaenia acuta Hilse 1866 Extremely Rare
Spirotaenia beijerinckii Coesel 2002 Data Deficient
Spirotaenia closteridia (Kütz.) Rabenh. 1868 Threat of Unknown Extent
Spirotaenia condensata Ralfs 1848 Highly Threatened
Spirotaenia endospira W. Archer 1864 Data Deficient
Spirotaenia minuta Thuret ex Bréb. 1856 Threat of Unknown Extent
Spirotaenia oblonga Lütkem. 1903 Data Deficient
Spondylosium depressum Kütz. 1849 Threat of Unknown Extent
Spondylosium panduriforme (Heimerl) Teiling 1957 Not Threatened
Spondylosium papillosum West & G.S. West 1895 Highly Threatened
Spondylosium planum (Wolle) West & G.S. West 1912 Not Threatened
Spondylosium pulchellum (W. Archer) W. Archer 1861 var. pulchellum Threatened
Spondylosium pulchellum var. bambusinoides (Wittr.) P. Lundell 1871 Highly Threatened
Spondylosium pygmaeum var. monile (W.B. Turner) West & al. 1923 Extremely Rare
Spondylosium secedens (De Bary) W. Archer 1861 Highly Threatened
Spondylosium tetragonum West 1892 Highly Threatened
Staurastrum aculeatum Ralfs 1848 Highly Threatened
Staurastrum acutum Bréb. 1856 var. acutum Data Deficient
Staurastrum alternans Ralfs 1848 Threatened
Staurastrum anatinum Cooke & A.W. Wills 1881 f. anatinum Data Deficient
Staurastrum anatinum f. parvum (West & G.S. West) Prescott & al. 1982 Data Deficient
Staurastrum arachne Ralfs 1848 Highly Threatened
Staurastrum arctiscon P. Lundell 1871 Extremely Rare
Staurastrum arcuatum Nordst. 1873 var. arcuatum Data Deficient
Staurastrum arcuatum var. subavicula (West) Coesel & Meesters 2013 Data Deficient
Staurastrum arnellii Boldt 1885 Data Deficient
Staurastrum avicula Ralfs 1848 var. avicula Threatened
Staurastrum avicula var. exornatum Messik. 1929 Data Deficient
Staurastrum avicula var. lunatum (Ralfs) Coesel & Meesters 2013 Threatened
Staurastrum avicula var. planctonicum (West & G.S. West) Coesel & Meesters 2013 Not Threatened
Staurastrum avicula var. subarcuatum (Wolle) West & G.S. West 1894 Data Deficient
Staurastrum bicorne Hauptfl. 1888 Extremely Rare
Staurastrum bieneanum Rabenh. 1862 Highly Threatened
Staurastrum bifidum Ralfs 1848 Extremely Rare
Staurastrum bloklandiae Coesel & Joosten 1996 Data Deficient
Staurastrum bohlinianum Schmidle 1898 Data Deficient
Staurastrum boreale West & G.S. West 1905 Highly Threatened
Staurastrum borgeanum Schmidle 1898 f. borgeanum Data Deficient
Staurastrum borgeanum f. minor Schmidle 1898 Data Deficient
Staurastrum botrophilum Wolle 1881 Data Deficient
Staurastrum brachiatum Ralfs 1848 Threatened
Staurastrum brasiliense Nordst. 1870 var. brasiliense Not Threatened
Staurastrum brebissonii W. Archer 1861 var. brebissonii Threatened
Staurastrum brebissonii var. brevispinum West 1892 Highly Threatened
Staurastrum brevispinum Ralfs 1848 Threatened
Staurastrum capitulum Ralfs 1848 Data Deficient
Staurastrum chaetoceras (Schröd.) G.M. Sm. 1924 Not Threatened
Staurastrum chavesii Bohlin 1901 Data Deficient
Staurastrum cingulum (West & G.S. West) G.M. Sm. 1921 Not Threatened
Staurastrum cingulum var. obesum G.M. Sm. 1922 Not established
Staurastrum clepsydra Nordst. 1870 Not Threatened
Staurastrum clevei (Wittr.) J. Roy 1893 Highly Threatened
Staurastrum controversum Ralfs 1848 Data Deficient
Staurastrum cosmospinosum (Børgesen) West & G.S. West 1900 Data Deficient
Staurastrum crassangulatum Coesel 2007 Data Deficient
Staurastrum crenulatum (Nägeli) Delponte 1877 Threatened
Staurastrum cristatum (Nägeli) W. Archer 1860 var. cristatum Threatened
Staurastrum cristatum var. cuneatum Hinode 1967 Data Deficient
Staurastrum cristatum var. oligacanthum (W. Archer) Coesel & Meesters 2013 Highly Threatened
Staurastrum cyrtocerum Ralfs 1848 var. cyrtocerum Highly Threatened
Staurastrum cyrtocerum var. inflexum Coesel & Meesters 2013 Highly Threatened
Staurastrum denticulatum (Nägeli) W. Archer 1861 Highly Threatened
Staurastrum diacanthum A. Lem. 1890 Data Deficient
Staurastrum dilatatum Ralfs 1848 Threatened
Staurastrum dimazum (Lütkem.) Grönblad 1920 Data Deficient
Staurastrum dispar Bréb. 1856 Highly Threatened
Staurastrum echinatum Ralfs 1848 Highly Threatened
Staurastrum erasum Bréb. 1856 Highly Threatened
Staurastrum eurycerum Skuja 1948 Data Deficient
Staurastrum excavatum West & G.S. West 1895 Data Deficient
Staurastrum furcatum (Ralfs) Bréb. 1856 var. furcatum Threatened
Staurastrum furcatum var. aciculiferum (West) Coesel 1996 Highly Threatened
Staurastrum furcigerum (Ralfs) W. Archer 1861 var. furcigerum Highly Threatened
Staurastrum gracile Ralfs 1848 var. gracile Near Threatened
Staurastrum gracile var. cyathiforme West & G.S. West 1895 Data Deficient
Staurastrum gracile var. nanum Wille 1880 Data Deficient
Staurastrum grallatorium Nordst. 1870 Data Deficient
Staurastrum grande Bulnh. 1861 Not Threatened
Staurastrum granulosum Ralfs 1848 Data Deficient
Staurastrum groenbladii Skuja 1931 Threat of Unknown Extent
Staurastrum hantzschii Reinsch 1866 var. hantzschii Data Deficient
Staurastrum hexacerum Wittr. 1872 var. hexacerum Threatened
Staurastrum hexacerum var. aversum West & G.S. West 1898 Data Deficient
Staurastrum hirsutum Ralfs 1848 var. hirsutum Threatened
Staurastrum hirsutum var. muricatum (Ralfs) Kurt Först. 1970 Threatened
Staurastrum horametrum J. Roy & Bisset 1893 Data Deficient
Staurastrum hystrix Ralfs 1848 Threatened
Staurastrum inconspicuum Nordst. 1873 Highly Threatened
Staurastrum insigne P. Lundell 1871 Threatened
Staurastrum kouwetsii Coesel 1996 Data Deficient
Staurastrum laeve Ralfs 1848 Highly Threatened
Staurastrum lanceolatum var. compressum West & G.S. West 1894 Threat of Unknown Extent
Staurastrum lapponicum (Schmidle) Grönblad 1926 Highly Threatened
Staurastrum lenzenwegeri Coesel & Meesters 2013 Data Deficient
Staurastrum limneticum Schmidle 1898 Not established
Staurastrum longipes (Nordst.) Teiling 1946 var. longipes Highly Threatened
Staurastrum longipes var. contractum Teiling 1946 Highly Threatened
Staurastrum longiradiatum West & G.S. West 1896 Data Deficient
Staurastrum longispinum (Bailey) W. Archer 1861 Not Threatened
Staurastrum manfeldtii Delponte 1877 var. manfeldtii Threat of Unknown Extent
Staurastrum margaritaceum Ralfs 1848 var. margaritaceum Threatened
Staurastrum margaritaceum var. hirtum Nordst. 1880 Data Deficient
Staurastrum meriani Reinsch 1867 Highly Threatened
Staurastrum messikommeri Lundb. 1931 Not established
Staurastrum micron West & G.S. West 1896 Threatened
Staurastrum micronoides Coesel & Joosten 1996 Data Deficient
Staurastrum minimum Coesel 1996 Data Deficient
Staurastrum monticulosum Ralfs 1848 Highly Threatened
Staurastrum muticum Ralfs 1848 Threatened
Staurastrum myrdalense (K. Strøm) Coesel & Meesters 2013 Threat of Unknown Extent
Staurastrum ophiura P. Lundell 1871 Not Threatened
Staurastrum orbiculare Ralfs 1848 var. orbiculare Not Threatened
Staurastrum oxyacanthum W. Archer 1860 var. oxyacanthum Highly Threatened
Staurastrum oxyacanthum var. polyacanthum Nordst. 1885 Data Deficient
Staurastrum paradoxoides Coesel & Meesters 2013 Threat of Unknown Extent
Staurastrum paradoxum Ralfs 1848 var. paradoxum Data Deficient
Staurastrum pentasterias Grönblad 1963 Threat of Unknown Extent
Staurastrum pilosum (Nägeli) W. Archer 1861 Highly Threatened
Staurastrum pingue Teiling 1942 var. pingue Threatened
Staurastrum pingue var. tridentata Nygaard 1949 Data Deficient
Staurastrum planctonicum Teiling 1946 var. planctonicum Threatened
Staurastrum planctonicum var. bulbosum (West) Thomasson 1960 Highly Threatened
Staurastrum podlachium B. Eichler & Gutw. 1894 Data Deficient
Staurastrum polonicum Racib. 1884 Data Deficient
Staurastrum polymorphum Ralfs 1848 var. polymorphum Threatened
Staurastrum polymorphum var. subgracile Wittrock 1872 Not established
Staurastrum polytrichum (Perty) Rabenh. 1868 Threatened
Staurastrum proboscideum (Ralfs) W. Archer 1861 Highly Threatened
Staurastrum pseudopelagicum West & G.S. West 1903 Data Deficient
Staurastrum pseudoplanctonicum W. Scharf 2009 Data Deficient
Staurastrum pseudotetracerum (Nordst.) West & G.S. West 1895 Data Deficient
Staurastrum punctulatum Ralfs 1848 var. punctulatum Not Threatened
Staurastrum pungens Ralfs 1848 Highly Threatened
Staurastrum pyramidatum West 1892 Highly Threatened
Staurastrum quadrangulare Ralfs 1848 Threat of Unknown Extent
Staurastrum quadratulum Coesel & Meesters 2013 Data Deficient
Staurastrum quadrispinatum W.B. Turner 1886 Threat of Unknown Extent
Staurastrum ralfsii (West & G.S. West) Coesel & Meesters 2013 var. ralfsii Data Deficient
Staurastrum ralfsii var. depressum (J. Roy & Bisset) Coesel & Meesters 2013 Highly Threatened
Staurastrum retusum W.B. Turner 1892 var. retusum Threat of Unknown Extent
Staurastrum retusum var. hians (B. Eichler & Gutw.) Coesel & Meesters 2013 Threat of Unknown Extent
Staurastrum sancti-sebaldi (Reinsch) P. Lundell 1871 var. sancti-sebaldi Not Threatened
Staurastrum sancti-sebaldi var. ornatum Nordst. 1867 (= Staurastrum sebaldi var. ornatum Nordst.) Not established
Staurastrum scabrum Ralfs 1848 Highly Threatened
Staurastrum senarium Ralfs 1848 Data Deficient
Staurastrum sexangulare (Bulnh.) P. Lundell 1863 Threat of Unknown Extent
Staurastrum sexcostatum Ralfs 1848 var. sexcostatum Threatened
Staurastrum simonyi Heimerl 1891 var. simonyi Data Deficient
Staurastrum simonyi var. semicirculare Coesel 1996 Data Deficient
Staurastrum smithii Teiling 1946 Data Deficient
Staurastrum spongiosum Ralfs 1848 var. spongiosum Threatened
Staurastrum striatum (West & G.S. West) Růžička 1957 Data Deficient
Staurastrum striolatum (Nägeli) W. Archer 1861 Highly Threatened
Staurastrum subbrebissonii Schmidle 1894 Data Deficient
Staurastrum subcruciatum Cooke & A.W. Wills 1887 Not Threatened
Staurastrum subexcavatum (Grönblad) Coesel & Meesters 2013 Data Deficient
Staurastrum teliferum Ralfs 1848 var. teliferum Threatened
Staurastrum teliferum var. gladiosum (W.B. Turner) Coesel & Meesters 2013 Highly Threatened
Staurastrum tenuissimum West & G.S. West 1895 Not established
Staurastrum tetracerum Ralfs 1848 var. tetracerum Not Threatened
Staurastrum trapezioides Coesel & Meesters 2013 Highly Threatened
Staurastrum tumidum Ralfs 1848 Highly Threatened
Staurastrum turgescens De Not. 1867 Data Deficient
Staurastrum vestitum Ralfs 1848 Highly Threatened
Staurodesmus aristiferus (Ralfs) Thomasson ex Kurt Först. 1983 Threatened
Staurodesmus bulnheimii (Racib.) Brook 1959 var. bulnheimii Threatened
Staurodesmus connatus (P. Lundell) Thomasson ex Kurt Först. 1983 Not Threatened
Staurodesmus convergens (Ralfs) Teiling 1948 var. convergens Not Threatened
Staurodesmus corniculatus (P. Lundell) Thomasson ex Kurt Först. 1983 Not Threatened
Staurodesmus cuspidatus (Ralfs) Teiling 1948 var. cuspidatus Not Threatened
Staurodesmus cuspidicurvatus Coesel & Meesters 2013 Data Deficient
Staurodesmus dejectus (Ralfs) Teiling 1954 var. dejectus Not Threatened
Staurodesmus dejectus var. apiculatus (Ralfs) Teiling 1954 Threatened
Staurodesmus dejectus var. robustus (Messik.) Coesel 1993 Data Deficient
Staurodesmus dickiei (Ralfs) S. Lill. 1950 var. dickiei Not Threatened
Staurodesmus dickiei var. circularis (W.B. Turner) Croasdale 1957 Threatened
Staurodesmus dickiei var. rhomboideus (West) S. Lill. 1950 Data Deficient
Staurodesmus extensus (O.F. Andersson) Teiling 1948 var. extensus Threatened
Staurodesmus extensus var. isthmosus (Heimerl) Coesel 1993 Data Deficient
Staurodesmus extensus var. joshuae (Gutw.) Teiling 1967 Data Deficient
Staurodesmus extensus var. rectus (B. Eichler & Racib.) Coesel & Meesters 2013 Data Deficient
Staurodesmus glaber (Ralfs) Teiling 1948 var. glaber Threatened
Staurodesmus glaber var. debaryanus (M. Jacobsen) Teiling 1948 Threatened
Staurodesmus incus (Ralfs) Teiling 1967 f. incus Threatened
Staurodesmus incus f. minus (West & G.S. West) Teiling 1967 Threatened
Staurodesmus leptodermus (P. Lundell) Teiling 1948 Not Threatened
Staurodesmus mamillatus (Nordst.) Teiling 1967 var. mamillatus Not Threatened
Staurodesmus mamillatus var. maximus (West) Teiling 1967 Not Threatened
Staurodesmus megacanthus (P. Lundell) Thunmark 1948 Not Threatened
Staurodesmus mucronatus (Bréb.) Croasdale 1957 var. mucronatus Not Threatened
Staurodesmus mucronatus var. subtriangularis (West & G.S. West) Croasdale 1957 Not Threatened
Staurodesmus omearae (W. Archer) Teiling 1948 Data Deficient
Staurodesmus pachyrhynchus (Nordst.) Teiling 1967 Not Threatened
Staurodesmus patens (Nordst.) Croasdale 1957 Not Threatened
Staurodesmus phimus (W.B. Turner) Thomasson ex Kurt Först. 1982 Not Threatened
Staurodesmus pterosporus (P. Lundell) Prescott 1966 Threat of Unknown Extent
Staurodesmus ralfsii (West) G.H. Tomaszewicz 1988 Highly Threatened
Staurodesmus spencerianus (Nordst.) Teiling 1948 Data Deficient
Staurodesmus subhexagonus (West & G.S. West) Coesel 1993 Extremely Rare
Staurodesmus subtriangularis var. inflatus (West & G.S. West) Teiling 1967 Data Deficient
Staurodesmus subulatus (Kütz.) Croasdale 1957 Not Threatened
Staurodesmus triangularis (Lagerh.) Teiling 1948 var. triangularis Not Threatened
Staurodesmus triangularis var. malaccensis (C. Bernard) Coesel 1994 Data Deficient
Staurodesmus triangularis var. subparallelus (G.M. Sm.) Teiling 1948 Threatened
Staurodesmus unguiferus (W.B. Turner) Thomasson 1966 var. unguiferus Threatened
Staurodesmus validus (West & G.S. West) Thomasson 1960 var. validus Not Threatened
Staurodesmus validus var. subincus (West & G.S. West) Coesel & Meesters 2013 Highly Threatened
T
Teilingia excavata (Ralfs) Bourr. 1964 Not Threatened
Teilingia granulata (J. Roy & Bisset) Bourr. 1964 Not Threatened
Teilingia papillosa (West & G.S. West) Kurt Först. 1983 Highly Threatened
Teilingia wallichii (J. Jacobsen) Bourr. 1964 Data Deficient
Tetmemorus brebissonii Ralfs 1848 var. brebissonii Threatened
Tetmemorus brebissonii var. minor de Bary 1858 Threatened
Tetmemorus granulatus Ralfs 1848 Threatened
Tetmemorus laevis Ralfs 1848 var. laevis Threatened
Tetmemorus laevis var. minutus (de Bary) Willi Krieg. 1937 Data Deficient
Tortitaenia alpina (Schmidle) Brook 1998 Data Deficient
Tortitaenia obscura (Ralfs) Brook 1998 Highly Threatened
Tortitaenia trabeculata (A. Braun) Brook 1998 Extremely Rare
X
Xanthidium aculeatum Ralfs 1848 Highly Threatened
Xanthidium antilopaeum Kütz. 1849 var. antilopaeum Threatened
Xanthidium antilopaeum var. crameri Grönblad 1921 Threat of Unknown Extent
Xanthidium antilopaeum var. depauperatum West & G.S. West 1905 Threatened
Xanthidium antilopaeum var. dimazum Nordst. 1873 Threatened
Xanthidium antilopaeum var. hebridarum West & G.S. West 1905 Highly Threatened
Xanthidium antilopaeum var. incrassatum (Grönblad) Kurt Först. 1973 Data Deficient
Xanthidium antilopaeum var. laeve Schmidle 1893 Highly Threatened
Xanthidium antilopaeum var. minneapoliense Wolle 1884 Data Deficient
Xanthidium antilopaeum var. planum Y.V. Roll 1936 Data Deficient
Xanthidium antilopaeum var. polymazum Nordst. 1873 Threatened
Xanthidium antilopaeum var. triquetrum P. Lundell 1871 Data Deficient
Xanthidium armatum Ralfs 1848 Highly Threatened
Xanthidium bifidum (Bréb.) Deflandre 1929 Highly Threatened
Xanthidium brebissonii Ralfs 1848 Extremely Rare
Xanthidium cristatum Ralfs 1848 var. cristatum Highly Threatened
Xanthidium cristatum var. uncinatum Ralfs 1848 Highly Threatened
Xanthidium fasciculatum Ralfs 1848 var. fasciculatum Highly Threatened
Xanthidium fasciculatum var. oronense West & G.S. West 1896 Data Deficient
Xanthidium octocorne Ralfs 1848 Threatened