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Chlorophyceae: Chlorococcales: Scenedesmaceae

 Scenedesmus acutus
f. costulatus (Chodat) Uherkovich
Syn.: S. costulatus Chodat

Scenedesmus acutus 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 acutus f. costulatus (Chodat) Uherkovich, cell body 13-15 μm long, 5.5 μm wide, L/W=2.4-2.7, x 640, Toyonodai park (or Seseragi park), Toyonodai, Otone town, Saitama Pref., Japan, March 4, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Scenedesmus acutus Scenedesmus acutus
Cell body 12 μm long, 3.5 μm wide, L/W=3.4, x 610
Scenedesmus acuminatus

Images of collecting locality: Toyonodai park (or Seseragi park), Toyonodai, Otone town, Saitama Pref., Japan, March 4, 2006 by Y. Tsukii

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