Cosmarium contractum var. rotundatum Borge 1925

Division     Charophyta
Class     Zygnematophyceae
Order     Desmidiales
Family    Desmidiaceae

    Cells medium size, longer than broad; cells deeply constricted, sinus widely open; cells measure 31-45 µm in length, 22-32 µm in breadth, isthmus 5-10 µm broad. Semi cells circular; cell wall thick, punctate; chloroplast axile, one per semi cell with a single central pyrenoid.


Thalli collected as plankton and prefers oligo-mesotrophic waters.

Distribution in India

Tamil Nadu