Phylum: Charophyta Family: Desmidiaceae
Cosmarium vexatum var. lacustre Messikommer 1935
Cosmarium vexatum is regarded as a doubtful species and Kouwets (in manuscript) is proposing to rename this taxon as a reclassified species. Because of taxonomic confusion, distribution is unclear. It would seem to prefer slightly acidic condition.
Messikommer, E. (1935) Die Algenwelt der innern Plessuralpen.
Kouwets, F.A.C. (in manuscript) European Flora of the Desmid Genus Cosmarium.