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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum alternans
var. subalternans Maskell

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 (Illustrations of The Japanese Fresh-water Algae, 1977)
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)

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Staurastrum alternans var. subalternans Maskell, cell body excluding spines ?? μm long, 29 μm wide, constriction ?? μm wide, x 400, x 640, Japan, 1998 by Y Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum Staurastrum Staurastrum Staurastrum

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