image_list image_listE

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 about 59 μm long, 51 μm wide, constriction 20 μm wide, x 640, Sai-ko, Nishi-Urawa, Saitama Pref., Japan, June 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium

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).

Please click on images for viewing enlarged.
Copyright Protist Information Server