Phylum: Charophyta   Family: Desmidiaceae

Actinotaenium didymocarpum (P.M. Lundell) P.F.M. Coesel & A. Delfos 1986

Cells cylindric with the sinus barely visible. Apices truncately rounded, chloroplast asteroid with one pyrenoid.
Cell dimensions: L: 30-43 µm; B: 12-18 µm; L/B: 2.20-2.70.
An acidophile of moorland pools and bogs.

References: 
Coesel, P.F.M. & Meesters, K.J. (2023 second edition). Desmids of the Lowlands.
Van Westen, M.C. (2024). Sieralgen in Drenthe.