Gamophyceae:
Zygnematales: Desmidiaceae
Cosmarium regnellii
Wille var. 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).
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Cosmarium regnellii (or C. abbreviatum ?),
cell body 15.5 μm long, 15 μm wide, isthmus 5.5 μm wide,
x 640, Norin Park (Agricultural and Forest park), Kawamoto town, Saitama Pref., Japan, August 16, 2004 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Cosmarium regnellii (or C. abbreviatum ?),
cell body 14 μm long, 14 μm wide, isthmus 5 μm wide,
x 640, Norin Park (Agricultural and Forest park), Kawamoto town, Saitama Pref., Japan, August 16, 2004 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
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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