Species [var. setaceum]:
Cell body quickly attenuated toward both ends (cf. C. ralfsii),
each extended part longer than spindle-shaped part at middle (cf. C. kuetzingii),
150-(252-528)-600 μm long, 6-(8.6-17) μm wide,
L/W=30-33; cell wall transparent or slightly yellowish, finely striated
(Illustrations of The Japanese Fresh-water Algae, 1977).
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100 μm
200 μm
300 μm; x 200 :
50 μm
100 μm
150 μm; x 400
Closterium setaceum,
295 μm long,
x 200, x 640, by Y. Tsukii
100 μm
200 μm
300 μm; x 200 :
31 μm
63 μm
94 μm; x 640
* Closterium setaceum Ehrenberg var. setaceum f. setaceum: Cell body small in size, elongate, L/W= 30-42, 252-528 μm long, 6-16 μm wide; both termini slightly curved, spindle-shaped at middle; cell wall transparent or brownish with thin lines (8-13 lines/10 μm wide); 2-3 pyrenoids in each half-cell (Photomicrographs of the Fresh-water Algae, vol. 6, 1997).
Closterium kuetzingii Brébisson var. kuetzingii: Cell body moderate in size, elongate, L/W= 18-30, 270-512 μm long, 13-22 μm wide; both termini slightly curved, spindle-shaped at middle; cell wall transparent or brownish with thin lines (8-11 lines/10 μm wide); chloroplasts composed of 5 lamellae; 4-6 pyrenoids in each half-cell (Photomicrographs of the Fresh-water Algae, vol. 4, 1985).
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