Phylum: Charophyta   Family: Desmidiaceae

Closterium leibleinii Kützing ex Ralfs 1848

A species that prefers circumneutral to slightly alkaline waters. In the Outer hebrides it is found in shallow loch-margins but rather scarce.

References: 
Brook, A.J. & Williamson, D.B. (2010) A Monograph on some British Desmids.
Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands.