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Gamophyceae: Zygnematales: Desmidiaceae

 Euastrum humerosum
Ralfs

Euastrum Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)
Species: Cell body 95-132 μm long, 56-70 μm wide, L/W=1.7, isthmus 15.4-22 μm wide; upper lateral lobes mamillate and projected obliquely upward, located slightly anterior from the middle line of semicells; a single pore present at the center of semicells (Illustrations of The Japanese Fresh-water Algae, 1977).

Euastrum humerosum Ralfs var. ??, cell body 110 μm long, 57 μm wide, L/W=1.9, isthmus 17 μm wide, x 640, Tanohara marsh, Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 19, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum humerosum Euastrum humerosum Euastrum humerosum Euastrum humerosum

Euastrum humerosum Ralfs var. ??, cell body 101 μm long, 58 μm wide, L/W=1.7, isthmus 18 μm wide, x 640, Tanohara marsh, Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 19, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum humerosum Euastrum humerosum

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