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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium costatum
var. westii Cushman

Closterium costatum Species [var. costatum]: Cell body medium in size, inner side straight, outer side strongly convex, both termini conical, 200-(304-385)-550 μm long, (28-41)-70 μm wide, L/W=6-8; cell wall brownish in color, striae separated each other (5-6 within 10 μm), ridged at both termini; chloroplasts with 5-6 laminae, 6-8 pyrenoids in each semicell.
[var. westii]: Cell body more elongate, curved, 230-(336-480) μm long, 23-(30-43) μm wide, L/W=8-11; striae thin at the center, thick at both termini; small dots present between the striae (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -- >> C. striolatum; C. intermedium; C. angustatum;

Closterium costatum var. westii Cushman, cell body 430 μm long, 38 μm wide, L/W=, x 200, x 400, x 640, Kodanuki marsh, Fujinomiya city, Shizuoka Pref., Japan, April 29, 2006 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
Closterium costatum Closterium costatum Closterium costatum Closterium costatum Closterium costatum Closterium costatum

Closterium costatum var. westii Cushman, cell body 276 μm long, 39 μm wide, L/W=, x 200, x 400, x 640, Kodanuki marsh, Fujinomiya city, Shizuoka Pref., Japan, April 29, 2006 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
Closterium costatum Closterium costatum Closterium costatum Closterium costatum Closterium costatum Closterium costatum Closterium costatum

Images of collecting locality: Kodanuki marsh, Fujinomiya city, Shizuoka Pref., Japan, April 29, 2006 by Y. Tsukii

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