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). |
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
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).