Staurastrum longibrachiatum (Borge) Gutwinski 1902

    Cells more or less broad than long, deeply constricted with open shallow, V-shaped sinus. Cells 30-43 µm in length, 47-75 µm in breadth (with processes), 10-15 µm in breadth (without processes), 7-13 µm broad at isthmus; spines 2-5 µm long. Semi cells bowl-shaped, apical angles with parallel or converged, denticulate processes, end with bifid or trifid spines. Cell wall ornamented with denticulations, emarginated verrucae on ventral margin at base of semi cells.