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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium dianae
Ehrenberg var. arcuatum (Brébisson) Rabenhorst

Closterium dianae Species [ var. dianae ]: Cell body slightly curved, tapered toward both ends, truncated with slanted edges, small pores present at outside of both termini, inner side at center slightly convex, 150-380 μm long, 15-40 μm wide, L/W = 10-12; cell wall smooth; chloroplasts with 5-8 pyrenoids in each chloroplast (Illustrations of The Japanese Fresh-water Algae, 1977).
Cell body 160-323 μm long, 20-28 μm wide, L/W=8.3-12; chloroplasts with about 6 laminae; semicells with 4-8 pyrenoids (Photomicrographs of the Freshwater Algae, vol. 6, 1987).
[var. arcuatum] Cell body 135-300 μm long, 12-22 μm wide, L/W=9-12; (Illustrations of The Japanese Fresh-water Algae, 1977). Cell body 243-313 μm long, 17-24 μm wide, L/W=13-15; (Photomicrographs of the Freshwater Algae, vol. 9, 1989).

Closterium dianae var. arcuatum (Brébisson) Rabenhorst, (or Closterium ralfsii var. gracilius ?), cell body 281 μm long, 23 μm wide, L/W = 12, cell wall brownish, tapered at both termini, 8 pyrenoids in half-cell (16 pyrenoids in a cell), x 200, x 400, x 640, Japan, 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. ralfsii Brébisson var. ralfsii: 300-(375)-610 μm long, (30)-40-62 μm wide; L/W = 6-9; spindle-shaped cell slightly curved, swells at center, tapered at termini; cell wall brownish, 7-9 fine ridges within 10 μm; 6-9 pyrenoids in a half-cell arranged in a single line (Illustrations of The Japanese Fresh-water Algae, 1977).

* C. ralfsii var. gracilius (Maskell) Krieger: Smaller and narrower than var. ralfsii; 140-(240)-242 μm long, 11-(14)-25 μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977).

C. moniliferum (Bory) Ehrenberg var. moniliferum: 170-(235-384)-450 μm long, 28-(36-60)-72 μm wide; L/W = 6-8; cell body slightly curved; both termini broadly rounded; cell wall transparent, smooth; chloroplasts with about 4 ridges of laminae; pyrenoids arranged in a single line (Illustrations of The Japanese Fresh-water Algae, 1977).

C. moniliferum var. concavum Klebs: cell body curved more strongly than var. moniliferum; 187-(300-344)-372 μm long, 30-(39-45)-56 μm wide; cell wall transparent, smooth; chloroplasts with about 4 ridges of laminae; pyrenoids arranged in a single line (Illustrations of The Japanese Fresh-water Algae, 1977).

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