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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 343 μm long, 39 μm wide, L/W=8.8, cell wall striated, bands present, x 400, x 640, near Imori pond, Myoko-kogen (Myoko highland), Myoko village, Niigata Pref., Japan, November 7, 2004 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
Closterium costatum Closterium costatum Closterium costatum

Closterium costatum var. westii Cushman, abnormality caused by prolonged culture with KCM & Hyponex (?), cell body 174 μm long, 31 μm wide, L/W=5.6, x 400, x 640, near Imori pond, Myoko-kogen (Myoko highland), Myoko village, Niigata Pref., Japan, November 7, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium libellula Closterium libellula Closterium libellula
Closterium libellula Closterium libellula


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