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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 μm long, μm wide, L/W=, x 640, rice field near Oyomi marsh, Hakuba village, Nagano Pref., Japan, June 1, 2008 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium botrytis Cosmarium botrytis Cosmarium botrytis

Images of collecting locality: Rice field near Oyomi marsh, Hakuba village, Nagano Pref., Japan, June 1, 2008 by Y. Tsukii


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