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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

Closterium rectimarginatum

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Closterium rectimarginatum 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).
Species:
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Closterium rectimarginatum ?, cell body 165 μm long, 26 μm wide, L/W = 6.3, 3-4 pyrenoids in each semicell, x 400, x 640, Higashi-hiroshima city, Hiroshima Pref., Japan, September 1998 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 Closterium Closterium

C. navicula (Brébisson) Lütkemüller: Cell body not curved spindle or boat in shape; 24-(35-84)-93 μm long, 8-(11-20)-22 μm wide; L/W = 3-4; a single chloroplast and 1 or 2 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).

C. libellula Focke var. libellula: Similar to C. navucula (not curved, spindle or boat in shape) but large; 170-(216-224)-450 μm long, 30-(42-48)-52 μm wide; L/W = 5-8; chloroplast with 8-12 ridges; 3-5 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).

* C. libellula var. intermedium (Roy et Bisset) G. S. West: Smaller than var. libellula; 75-(123-174) μm long, 15-(20-32)-36 μm wide; 3-4 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).


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