Phylum: Charophyta   Family: Closteriaceae

Closterium closterioides (J. Ralfs) A. Louis & F. Peeters 1967

First described by Ralfs (1848: 152, pl. 34: 4) and illustrated by Jenner as Penium closterioides. It was later moved to Closterium by Louis & Peeters (1967: 410, pl. 13: 119).
Cell dimensions: L: 286-325 µm; B: 42-46 µm; Ap: 17-18 µm; L/B: 7-8.
A relatively common acidophile of moorland pools and Sphagnum bogs.

References: 
Brook, A.J. & Williamson, D.B (2010). A Monograph on some British Desmids.
Coesel, P.F.M. & Meesters, K.J. (2023 second edition). Desmids of the Lowlands.
Louis, A. & Peeters, F. (1967). Observations écologiques et floristiques sur la florule algale du nord de la Campine belge.
Ralfs, J. (1848). The British Desmidieae.
Van Westen, M. (2024). Sieralgen in Drenthe.