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Chlorophyceae: Chlorococcales: Scenedesmaceae

Scenedesmus serratus
(Corda) Bohlin. var. serratus

Scenedesmus 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: Colonies surrounded by mucilage; cell body oblong cylindrical with rounded ends, 6.4-17.5 μm long, 1.7-6.6 μm wide; cells arranged in a linear series contacting with about 80% of lateral walls, outer cells slightly convex, with short spines on cell pole in two lateral rows, inner cells on one side with a longitudinal row of short spines; cell wall smooth (Photomicrographs of the Freshwater Algae, vol. 19, 1997).
Similar species -->> S. circumfusus;

Scenedesmus serratus (or S. circumfusus Hortobagyi var. circumfusus ??), cell body 15 μm long, 4 μm wide, L/W=3.8, x 640, Kumakubo, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, December, 2005, collected by Eizaburo Tsukii, photo by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Scenedesmus acutus Scenedesmus acutus

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