Phylum: Charophyta Family: Desmidiaceae
Cosmarium laeve Rabenhorst 1868
Rabenhorst's original description is rather brief and sketchy, which has led to confused interpretations and spawned many varieties, creating a rather confused complex. Kouwets (in manuscript) is attempting to bring some order by describing new species. This Haclait find may well end up as C. laeviforme.
Kouwets, F.A.C. (in manuscript) European Flora of the Desmid Genus Cosmarium.