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Chlorophyceae: Chlorococcales: Scenedesmaceae

 Scenedesmus costatus
Schmidle var. costatus
->> Enallax costatus (Schmidle) Pascher

Scenedesmus costatus 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:

Enallax costatus (Schmidle) Pascher, formerly Scenedesmus costatus Schmidle var. costatus, or S. alpinus Ergasev 1979 (=E. alpinus Pascher 1943 ?), cell body μm long, μm wide, L/W=, or Scotiella ?, x 640, No.1, Chigo-ike marsh (or Yakebitai marsh) at the top of Yakebitai mountain, Shiga highland (Oku-shiga highland), Yamanouchi town, Nagano Pref., Japan, July 20, 2008 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Scenedesmus costatus Scenedesmus costatus

Images of collecting locality: No.2, Chigo-ike marsh (or Yakebitai marsh) at the top of Yakebitai mountain, Shiga highland (Oku-shiga highland), Yamanouchi town, Nagano Pref., Japan, July 20, 2008 by Y. Tsukii

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