Cosmarium venustum var. excavatum (B.Eichler & Gutwinski) West & G.S. West 1895

Division     Charophyta
Class     Zygnematophyceae
Order     Desmidiales
Family    Desmidiaceae
Basionym     Cosmarium trilobulatum var. excavatum Eichler & Gutwinski
SynonymCosmarium venustum f. ocellatum Ducellier 1918

    Cells small size and longer than broad measure 23–32 μm in length and 20–25 μm width. Cells deeply constricted and sinus linearly closed; isthmus 6–8 μm. Semicell trapezoid shapes with rounded apical and basal angles. Lateral margin shows 2–3 undulations; the apex truncated apex with 2–3 undulations. Semicells covered with small granules; circular in lateral view and elliptical in vertical view.


Thalli collected as plankton from acidic and oligotrophic water bodies.

Distribution in India

Tamil Nadu.