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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum alternans
Brébisson var. alternans

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

Staurastrum alternans Brébisson var. alternans or S. lapponicum ?, cell body 31 μm long, 40 μm wide, L/W=0.8, isthmus 10 μm wide, x 640, Hasu-ike (pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 19, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum Staurastrum Staurastrum Staurastrum Staurastrum
Cell body μm long, 33 μm wide, L/W=, isthmus μm wide, x 640
Staurastrum punctulatum

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