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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium regnellii
Wille var. regnellii

Cosmarium regnellii Genus: Unicellular; variable in shape; a constriction at the center of the cell body; mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal, rectangular, pyramidal or kidney-shaped; no apical indentation (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body small, (14-18)-22 μm long, (11-16.8)-22 μm wide, isthmus (11-16.8)-22 μm wide; (Illustrations of the Japanese fresh-water algae, 1977).

Cosmarium regnellii Wille regnellii ??, cell body 25 μm long, 20 μm wide, isthmus 5.5 μm wide, L/W=1.3, x 640, Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, May 15, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium regnellii Cosmarium regnellii

Cosmarium regnellii Will var. regnellii: Cell body small, (14-18)-22 μm long, (11-16.8)-22 μm wide, isthmus (11-16.8)-22 μm wide; (Illustrations of the Japanese fresh-water algae, 1977).

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