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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 μm long, μm wide, x 640, Omine-numa (pond/marsh), Tsukiyono town, Gunma Pref., Japan, September 2003 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum alternans Staurastrum alternans Staurastrum alternans Staurastrum alternans
Staurastrum alternans Staurastrum alternans Staurastrum alternans Staurastrum alternans Staurastrum alternans
Staurastrum alternans Staurastrum alternans Staurastrum alternans Staurastrum alternans Staurastrum alternans Staurastrum alternans

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