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Chlorophyceae: Chlorococcales: Scenedesmaceae

 Scenedesmus quadricauda
(Turpin) Brébisson sensu Chodat, 1913 var. biornatus Kiss

Scenedesmus quadricauda 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 [ var. quadricauda ]: Colonies of 2, 4 or 8 cells arranging linearly; cell body elongated ellipsoidal, 11-18 μm long, 3.5-7 μm wide; terminal cells with long spiny projections (10-17 μm long); cell wall smooth.
[ var. biornatus ]: Cell body 7-15 μm long, 3-5 μm wide; all cells have spiny projections (5-14 μm long) at both ends (Illustrations of The Japanese Fresh-water Algae, 1977).
S= length of Spines; L=Body length

Scenedesmus quadricauda var. biornatus ? (similar to S. intermedius var. balatonicus Hortbagyi, but cells arranged linearly not zigzag), cell body 24 μm long, 5.5 μm wide, spines 26 μm long, L/W= 4.4, S/L = 1.1, inner cells longer than terminal cells, x 400, x 640, Saitama Pref., Japan, October 1999, 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 Scenedesmus Scenedesmus Scenedesmus
Scenedesmus Scenedesmus

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