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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium abbreviatum
Raciborski var. abbreviatum

Cosmarium abbreviatum Species [ var. abbreviatum ]: Cell body (11-15)-22 μm long, (11-14.5)-22 μm wide, L/W=1.0, isthmus (4.2-5.6)-7 μm wide; semicells broad hexagon in shape.
[ f. minor ]: 8-8.4 μ;m long, 8.5-9 μm wide.
[ var. planctonicum ]: (14)-19-29 μm long, (14)-22-30 μm wide; each corner rounded, apical margin convex.
[ f. pygmaea ]: Cell body smaller, upper side of lateral margins longer than lower side and concave, 11-14 μm long, 12-14 μm wide, isthmus 4.2-6 μm wide.
[ var. gremanicum ]: Apical and lateral margins slightly concave, 12.6 μm long, 11.2 μm wide, isthmus 3.4 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).


Cosmarium abbreviatum var. ??, cell body 13 μm long, 10 μm wide, L/W=1.3, isthmus 4 μm wide, x 640, Shimo-no-koike (small pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, September 26, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium


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