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Gamophyceae: Zygnematales: Desmidiaceae

 Euastrum spinulosum
var. inermius Nordstedt

Euastrum spinulosum Subgenus: Atomum (Apical area slightly depressed)
Section: Retusa (Cell body large; granulated dome(s) at the center of each semicell)
Species: Cell body 64.5-75.3 μm long, 56-64.5 μm wide, constriction 14-17 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Euastrum spinulosum var. inermius Nordstedt, cell body 60 μm long, 55 μm wide, isthmus 18 μm wide, x 640, rice field, Kamishiro, Hakuba village, Nagano Pref., Japan, October 3, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum spinulosum Euastrum spinulosum
Cell body 58 μm long, 50 μm wide, isthmus 16 μm wide, x 640
Euastrum spinulosum Euastrum spinulosum Euastrum spinulosum Euastrum spinulosum Euastrum spinulosum

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