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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, semicell 56 μm long, 51 μm wide, L/W=, isthmus 18 μm wide, x 640, Ko-numa (pond or lake), near Kakumanbuchi, Akagi mountain, Fujimi village, Gunma Pref., Japan, May 27, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum humerosum Euastrum humerosum
Cell body 115 μm long, 60 μm wide, L/W=1.9, isthmus 20 μm wide, x 640
Euastrum humerosum Euastrum humerosum Euastrum humerosum

Images of collecting locality: Ko-numa (pond or lake), near Kakumanbuchi, Akagi mountain, Fujimi village, Gunma Pref., Japan, May 27, 2007 by Y. Tsukii

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