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Chlorophyceae: Chlorococcales: Scenedesmaceae

 Scenedesmus acuminatus
(Lagerheim) Chodat

Scenedesmus acuminatus 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 acuminatus (Lagerheim) Chodat var. acuminatus, cell body spindle-shaped, 26 μm long, 6 μm wide, L/W=4.3, x 640, Futayo-no-ike (pond) near Haguro mountain, Haguro town, Yamagata Pref., Japan, July 10, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Scenedesmus acuminatus Scenedesmus acuminatus

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