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Chlorophyceae: Chlorococcales: Scenedesmaceae

 Scenedesmus protuberans
Fritsch

Scenedesmus protuberans 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 protuberans Fritsch (or S. opoliensis Richter ?), cell body 18 μm long, 5 μm wide, spines 20 μm long, L/W=3.6, S/L=1.1, x 640, Bessho-numa, Saitama Pref., Japan, June 2001 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Scenedesmus protuberans Scenedesmus protuberans

Scenedesmus protuberans Fritsch, x 640, Green-Park, Nishi-Urawa, Saitama Pref., Japan, June 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Scenedesmus protuberans Scenedesmus protuberans

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