Phylum: Charophyta   Family: Desmidiaceae

Cosmarium pseudowembaerense  Kouwets

A fairly recently described species found in circumneutral waters. Distribution little known and easily overlooked

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