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Gamophyceae: Zygnematales: Desmidiaceae

 Euastrum binale
var. sectum (W.B. Turner) Willi Krieger

Euastrum Subgenus: Atomum (Apical area slightly depressed)
Section: Simplicia (Cell body small; cell surface smooth)
Species: Cell body small, 15-30 μm long, 12.5-21 μm wide, constriction 3-8 μm wide, L/W=1.3; semicells pyramidal in shape, basal lobes rounded, anterior margin broad, slightly depressed at the center, both corners slightly pointed; lateral view of the semicells ovoidal, apical view ellipsoidal, both sides convex (Illustrations of The Japanese Fresh-water Algae, 1977).

Euastrum binale var. sectum Turner, cell body 20 μm long, 16 μm wide, L/W=1.3, isthmus 5 μm wide, x 640, Jodo-daira (bog or marsh) , Azuma mountain, Fukushima city, Fukushima Pref., Japan, September 3, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum
Cell body 19 μm long, 15 μm wide, L/W=1.3, isthmus 5 μm wide, x 640
Euastrum Euastrum

Images of collecting locality: No. 2, Jodo-daira (bog or marsh) , Azuma mountain, Fukushima city, Fukushima Pref., Japan, September 3, 2006 by Y. Tsukii

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