Phylum: Charophyta   Family: Desmidiaceae

Cosmarium medioretusum Coesel

Status uncertain as there are little data available. Would seem to prefer circumneutral waters such as loch-margins, moorland pools and disused peat-cuttings

References: 
Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands