Phylum: Charophyta   Family: Desmidiaceae

Cosmarium regnellii var. pseudoregnellii (Messikommer) Willi Krieger

Messikommer (1929) as Cosmarium braunii var. pseudoregnellii, found it in peat-cuttings in Switzerland. It was transferred to C. regnellii by Krieger (1944). Coesel (1979) also found and illustrated this species. Kouwets (in manuscript) is proposing to raise this variety to species level. Found in circumneutral, meso-oligotrophic waters.

References: 
Kouwets, F.A.C. (in manuscript) European Flora of the Desmid Genus Cosmarium
Messikommer, E. (1929) Beiträge zur Kenntnis der Algenflora des Kantons Zürich. IV. Folge Die Algenvegetation der Moore am Pfäffikersee
Krieger, W. (1944) Süßwasseralgen aus Griechenland
Coesel, P.F.M. (1979) Desmids of the broads area of N.W. Overijssel (The Netherlands) II