Gamophyceae:
Zygnematales: Desmidiaceae
Cosmarium sportella
Brébisson var. sportella
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. sportella):
Cell body 34-42-45 μm long, 30-42-45 μm wide,
isthmus 10-13-14.5 μm wide, large granules present at the center of the semicells;
apex flat; (Illustrations of The Japanese Fresh-water Algae, 1977).
|
Similar species -- >>
C. vexatum;
C. botrytis;
Cosmarium sportella Brébisson var. subnudum W. et G.S. West ?,
cell body 42 μm long, 36 μm wide, 13 μm wide,
x 400, x 640, Vermont-Maine U.S.A., August 7-13, 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).
* 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).
Please click on images for viewing enlarged.
Copyright
Protist Information Server