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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, cell body 15 μm long, 3 μm wide, spines 15 μm long, L/W=5, S/L=1, x 400, x 640, Saitama Pref., Japan, May-June 1999 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Scenedesmus Scenedesmus

Scenedesmus protuberans Fritsch: Colonies of spindle-shaped cells, each cell 11-34 μm long, 3.5-7 μm wide, spines 10-20 μm long (Illustrations of The Japanese Fresh-water Algae, 1977).

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