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Chlorophyceae: Chlorococcales: Scenedesmaceae

Scenedesmus ovalternus
Chodat var. ovalternus

Scenedesmus 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 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
scale 31 μm scale 63 μm scale 94 μm; x 640
Scenedesmus ovalternus Scenedesmus ovalternus

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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