Phylum: Charophyta   Family: Desmidiaceae

Cosmarium subreinschii Schmidle 1894

A rare species found in mesotrophic, slightly acidic, waters such as moorland pools and loch-margins.
Cell dimensions: L: 18-23 µm, B: 14-18 µm, Is: 4.5-6 µm; Th: 9-10 µm, L/B: 1.2-1.3.

References: 
Coesel, P.F.M. & Meesters, K.J. (2023 second edition). Desmids of the Lowlands.
Kouwets, F.A.C. (2025). European Flora of the Desmid Genus Cosmarium.
Schmidle, W. (1894). Aus der Chlorophyceenflora der Torfstiche zu Viernheim.
Van Westen, M. (2024). Sieralgen in Drenthe.