Phylum: Charophyta Family: Desmidiaceae
Cosmarium obtusatum (Schmidle) Schmidle
Described as rather common and widely distributed on a European scale, but not proving too common in the Outer Hebrides. It prefers the tychoplankton of circumneutral waters
References:
Kouwets, F.A.C. (in manuscript) European Flora of the Desmid Genus Cosmarium
Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands