Gamophyceae:
Zygnematales: Desmidiaceae or Closteriaceae
Closterium kuetzingii
Brébisson var. kuetzingii
Genus: Cell body crescent in shape (long, curved, tapered at both ends); cross section rounded;
cell wall smooth or with longitudinal lines, bands on the cell wall in some species;
chloroplast laminae ridged and radially arranged, which makes cross section star-shaped;
pyrenoids aligned or scattered (Illustrations of The Japanese Fresh-water Algae, 1977).
Subgenus [Euclosterium]: Cell body curved.
Species: Cell body moderate in size, elongate,
270-512 μm long, 13-22 μm wide ( L/W= 18-30);
slightly curved at both ends, spindle-shaped at middle; both termini slighlty rounded;
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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Similar species -->>
C. ralfsii;
C. setaceum;
Closterium kuetzingii Brébisson
(or C. setaceum ?),
cell body 300 μm long, 16 μm wide, L/W =19,
x 400, x 640, Uruguay, November 1999, photo by Yuuji 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 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).
Please click on images for viewing enlarged.
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