Phylum: Charophyta   Family: Desmidiaceae

Cosmarium sphagnicola var. armatum W. Krieger & J. Gerloff 1965

There are several similar small cells that display four granules in an asymmetric configuration. They are much confused, and more research is needed to better understand them. It may be possible to separate some of them on habitat preferences. The cell depicted below conformed to Kouwets’ (in manuscript) proposed Cosmarium pseudosphagnicola.
Cell dimensions: L: 8.5-10 µm; B: 9.7-11 µm; Is: 3.3-4 µm; Th: 4.5-5 µm; L/B: 0.9-0.95.

References: 
Kouwets, F.A.C. (2025). European Flora of the Desmid Genus Cosmarium.
Krieger, W. & Gerloff, J. (1962-9). Die Gattung Cosmarium