Gamophyceae:
Zygnematales: Desmidiaceae
Cosmarium botrytis
var. subtumidum Wittrock
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).
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C. sportella;
C. vexatum;
Cosmarium botrytis var. subtumidum Wittrock,
cell body about 59 μm long, 45 μm wide, isthmus μm wide,
x 400, x 640, Saitama Pref., Japan, May-June 1999 by Y. Tsukii
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
Cell body 58 μm long, 53 μm wide, isthmus μm wide, x 400, x 640
Cell body 62 μm long, 56 μm wide, isthmus μm wide, x 400, x 640
Cell body about 56 μm long, 45 μm wide, isthmus μm wide, x 400, x 640
Cosmarium botrytis var. subtumidum Wittrock,
Cell body 60 μm long, 54 μm wide, isthmus μm wide,
x 400, x 640, Japan, April 1999, by Y. Tsukii
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
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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