Chlorophyceae:
Chlorococcales: Scenedesmaceae
Scenedesmus ovalternus
Chodat var. ovalternus
Genus: Colonies of 4 (or 2, 8, 16) cells attached side by side, arranged linearly or zigzag;
cell body elliptical or spindle or crescent in shape; terminal cells with spiny projections in many species;
cell wall usually smooth, but in some species granulated or dented or ridged
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
|
Scenedesmus ovalternus or S. obtusus Meyen var. obtusus ??,
cell body 14 μm long, 8.5 μm wide,
x 400, x 640, Uruguay 1999, by Y. Tsukii
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
Cell body μm long, μm wide, x 400, x 640
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
Scenedesmus obtusus Meyen var. obtusus:
Colonies within a gelatinous envelope, flat or slightly curved;
4 cells arraned in alternate series, sometimes in cruciate series, 8 cells arranged in alternate or various double series;
cell body ovate or elliptical, up to 16.5 μm long, up to 9.5 μm wide,
termini of each cell may have a single nodular thickening;
cell wall smooth; a single chloroplast with one pyrenoid
(Photomicrographs of the Freshwater Algae, vol. 4, 1985).
Please click on images for viewing enlarged.
Copyright
Protist Information Server