Phylum: Charophyta   Family: Desmidiaceae

Cosmarium pyramidatiforme F.A.C. Kouwets 2025

A recently described large taxon in the C. pseudopyramidatum complex. The chloroplast supports several pyrenoids per semicell, typically three, but not always easy to see.
Cell dimensions (3): L: 61-71 µm; B: 42-46 µm; Is: 15-16.8 µm; Th: c.30 µm; L/B: 1.46-1.55.
Due to earlier confusion with similar taxa, the distribution is unknown. Cells found to date have come from acidic oligotrophic waters.

References: 
Kouwets, F.A.C. (2025). European Flora of the Desmid Genus Cosmarium.