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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)

Staurastrum alternans var. subalternans Maskell (or var. alternans ?), cell body 24 μm long, 28 μm wide, isthmus 8 μm wide, x 640, Iyari marsh, Omachi city, Nagano Pref., Japan, May 8, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum alternans Staurastrum alternans Staurastrum alternans Staurastrum alternans

Images of collecting locality: Iyari marsh, Omachi city, Nagano Pref., Japan, May 8, 2006 by Y. Tsukii

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