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:
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Scenedesmus ovalternus Chodat var. ovalternus,
cell body 11 μm long, 7 μm wide,
x 640, Tane-ike (pond), Togakushi highland, Shinano town, Nagano Pref., Japan, June 12, 2005 by Y. Tsukii
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).
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