Phylum: Charophyta   Family: Desmidiaceae

Closterium leibleinii J. Ralfs 1848

First described in Ralfs (1848: 167, pl, 28: 4 a-l) and illustrated by Jenner.
Single cell dimensions: L: 147 µm; B: 21.3 µm; Ap: 2.7 µm; Arc: 140°; L/B: 7.
A species that prefers circumneutral to slightly alkaline waters, although it has been found in more acidic habitats in Europe. In the Outer Hebrides it is found in shallow loch-margins but rarely recorded.

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.
Ralfs, J. (1848). The British Desmidieae.