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Gamophyceae: Zygnematales: Desmidiaceae

 Euastrum sp.

Euastrum Genus: Variable in shape and in size; mostly longer than wide; strong constriction at center; semicell pyramid-shaped, apically flattened with indentation (or notch, some species lack this notch); laterally straight or wavy or indented; one chloroplast in each semicell; one pyrenoid for each chloroplast (Illustrations of The Japanese Fresh-water Algae, 1977).
Subgenus: Atomum (Apical area slightly depressed)
Section: Retusa (Cell body large; granulated dome(s) at the center of each semicell)
Species:

Euastrum sp., basically similar to E. humerosum or E. affine, cell body 131 μm long, 69 μm wide, isthmus 25 μm wide, x 640, Numappara marsh, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, August 2003 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum Euastrum Euastrum

Euastrum ceylanicum (W. et G.S. West) Krieger: Cell body medium in size, 56-76 μm long, 45-62 μm wide, L/W=1.25; (Illustrations of the Japanese Fresh-water Algae, 1977).

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