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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum tetracerum
f. trigona Lundell

Staurastrum tetracerum Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells (Illustrations of The Japanese Fresh-water Algae, 1977)
Subgenus: with arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species:

Staurastrum tetracerum f. trigona Lundell ?, cell body 13 μm long, 12 μm wide (excluding arms, 11 μm long), L/W=1.1, isthmus 5.5 μm wide, x 640, Yakebe-ike (pond), Sayama park, Higashi-Murayama city, Tokyo, Japan, February 11, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum pseudosebaldi Staurastrum pseudosebaldi Staurastrum pseudosebaldi

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