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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium botrytis
var. subtumidum Wittrock

Cosmarium Species [ var. botrytis ]: Cell body (56-59)-65-95 μm long, (50-54)-68 μm wide, isthmus (14-18)-24 μm wide; semicells pyramidal in shape, basal corner broadly rounded, apex flattened or slightly convex, side and apical view elliptical; cell wall covered with uniformly arranged granules.
[var. subtumidum ]: Cell body broader than var. botrytis, 52-80 μm long, 43-65 μm wide, isthmus 10-15 μm wide; granules at the center of semicells larger than others (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -- >> C. sportella; C. vexatum;

Cosmarium botrytis var. subtumidum Wittrock, cell body 71 μm long, 55 μm wide, L/W=1.3, x 640, rice field, Senuki, Takaku-kou, Nasu town, Tochigi Pref., Japan, October 31, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium botrytis Cosmarium botrytis

Cosmarium botrytis var. subtumidum Wittrock: Cell body 52-(56)-80 μm long, 43-(51)-65 μm wide, isthmus 10-(14)-15 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977).

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