Staurastrum johnsonii West & G.S.West 1896

Division     Charophyta
Class     Zygnematophyceae
Order     Desmidiales
Family    Desmidiaceae

    Cells slightly broader than long, deeply constricted with shallow sinus; semi cells cup-shaped; apical angles with 3-4 emarginated verrucae (slender processes), lateral angles with parallel processes ends with trifid spines; cell wall ornamented with emarginated verrucae at apical angles, base of the semi cells, denticulated processes and a ring of granules at isthmus; chloroplast axile, one per semi cell with a central pyrenoid.

    In apical view, Semicells with 2(-3) radiate processes, ellipsoid to fusiform or a triangular shape. Cells measure 33-42 µm in length, 50-90 µm in breadth (with processes), 18-22 µm in breadth (without processes), 7-10 µm broad at isthmus.


Thalli collected as planktons and it prefers Oligo-mesotrophic water bodies.

Distribution in India

Kancheepuram (Tamil Nadu), Sundarbans (West Bengal).