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Scientific name
Cosmarium pseudoamoenum Wille 1884
Group of organisms
Desmidiales
Red List Category
Threatened
Responsibility of Germany
General responsibility
Current population status
rare
Long-term population trend
moderate decline
Short-term population trend
decrease of unknown extent
Previous Red List Category
No evidence, not listed without intentionally excluding the taxa or no confirmed established occurrence (neither under the same nor a different name).
Change of category compared to previous Red List
The change of category is not assessable, for example because the previous Red List does not list the taxon or the taxon has not been assessed in the previous Red List.
Further comments
Historische Nachweise aus Berlin und Nordbayern (Geissler & Kies 2003, Vollrath 2014).
Source

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