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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 63 μm long, 50 μm wide, L/W=1.3, isthmus 15 μm wide, x 640, a small pond at Obihiro University of Agriculture and Veterinary Medicine, Obihiro city, Hokkaido, Japan, October 13, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum spinulosum Euastrum spinulosum Euastrum spinulosum Euastrum spinulosum
Cell body 62 μm long, 50 μm wide, L/W=1.2, isthmus 14 μm wide, x 640
Euastrum spinulosum Euastrum spinulosum Euastrum spinulosum Euastrum spinulosum Euastrum spinulosum Euastrum spinulosum

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