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Chlorophyta: Gamophyceae: Zygnematales: Desmidiaceae

Staurastrum alternans
var. subalternans Maskell

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: with 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, tape No. 0040, time code 0500, cell body without spines ?? μm long, 29 μm wide, constriction ?? μm wide, x 400, x 640, Japan, 1998 by Y Tsukii

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