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Gamophyceae: Zygnematales: Desmidiaceae

Euastrum didelta
Ralfs var. didelta

Euastrum Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)

Species: Cell body 115-150 μm long, 53-70 μm wide, L/W=2.0, isthmus 18-26 μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977).


Euastrum didelta Ralfs var. didelta (or E. affine ?), semicell 69 μm long (cell body 138 μm), 70 μm wide, L/W=2.0, isthmus 20 μm wide, x 640, No.2, Hachiman-numa marsh, Hachimantai, Hachimantai city (formerly Ashiro town & Matsuo village), Iwate Pref., Japan, September 12, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum didelta Euastrum didelta Euastrum didelta
Cell body 127 μm long, 70 μm wide, L/W=, isthmus 23 μm wide, x 640
Euastrum didelta Euastrum didelta
Cell body 133 μm long, 70 μm wide, L/W=, isthmus 23 μm wide, x 640
Euastrum didelta Euastrum didelta

Images of collecting locality: No.2, Hachiman-numa marsh, Hachimantai, Hachimantai city (formerly Ashiro town & Matsuo village), Iwate Pref., Japan, September 12, 2006 by Y. Tsukii


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