Gamophyceae:
Zygnematales: Desmidiaceae or Closteriaceae
Closterium setaceum
Ehrenberg ex Ralfs 1848
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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C. setaceum;
Closterium setaceum Ehrenberg,
cell body 338 μm long, 10.5 μm wide, L/W=32,
pores present at both termini,
x 200, x 400, x 640, Koigakubo marsh, Tessei-cho, Okayama Pref., Japan, November 22, 2004 by Y. Tsukii
50 μm
100 μm
150 μm; x 400 :
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 BrébissonBrébisson 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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