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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 120 μm long, 65 μm wide, L/W=1.8, isthmus 17 μm wide, x 640, standing water near Hyoutan-ike (pond), Uba-ga-daira, Nasu town, Tochigi Pref., Japan, July 16, 2006, collected by Eizaburo Tsukii, photo by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum Euastrum Euastrum
Cell body (Top view) μm long, μm wide, L/W=, isthmus 17 μm wide, x 640
Euastrum Euastrum Euastrum
Cell body 115 μm long, 63 μm wide, L/W=1.8, isthmus 17 μm wide, x 640
Euastrum
Cell body 111 μm long, 58 μm wide, L/W=1.9, isthmus 17 μm wide, x 640
Euastrum Euastrum Euastrum
Cell body 115 μm long, 60 μm wide, L/W=1.9, isthmus 16 μm wide, x 640
Euastrum Euastrum

Euastrum humerosum Ralfs var. ??, semicell 50 μm long, 58 μm wide, L/W=, isthmus ?? μm wide, x 640, Hyoutan-ike (pond), Uba-ga-daira, Nasu town, Tochigi Pref., Japan, July 16, 2006, collected by Eizaburo Tsukii, photo by Y. Tsukii
Euastrum Euastrum Euastrum
Cell body 110 μm long, 60 μm wide, L/W=1.8, isthmus 19 μm wide, x 640
Euastrum

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