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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum sp.

Staurastrum 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: lacks arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species:

Staurastrum scabrum Brébisson ?, cell body 35 μm long, 30 μm wide, L/W=1.2, isthmus 10 μm wide, x 640, No.3, Tanohara marsh, Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 17, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum scabrum Staurastrum scabrum Staurastrum scabrum Staurastrum scabrum Staurastrum scabrum Staurastrum scabrum
Cell body 35 μm long, 35 μm wide, L/W=1.0, isthmus 15 μm wide, x 640
Staurastrum scabrum Staurastrum scabrum Staurastrum scabrum Staurastrum scabrum Staurastrum scabrum Staurastrum scabrum

Images of collecting locality: No.3, Tanohara marsh, Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 17, 2007 by Y. Tsukii

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