Gamophyceae:
Zygnematales: Desmidiaceae
Cosmarium sportella
Brébisson var. subnudum W. et G.S. West
Genus: Unicellular; variable in shape; a constriction at the center of the cell body;
mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal,
rectangular, pyramidal or kidney-shaped; no apical indentation
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species (var. subnudum):
Cell body (42)-51 μm long, (33.6)-41 μm wide,
isthmus 11-(14.5) μm wide, apex slightly depressed;
(Illustrations of The Japanese Fresh-water Algae, 1977).
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Similar species -- >>
C. vexatum;
C. botrytis;
Cosmarium sportella Brébisson var. subnudum ?,
cell body 46 μm long, 41 μm wide,
x 640, Kuroiso Park, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, August 2003 by Y. Tsukii
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).
* Cosmarium sportella Brébisson var. subnudum:
Cell body (42)-51 μm long, (33.6)-41 μm wide,
isthmus 11-(14.5) μm wide, apex slightly depressed;
(Illustrations of The Japanese Fresh-water Algae, 1977).
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