Species [ var. sublatum ]:
[ var. maius Krieger]: Cell body slightly curved, spindle-shaped, both ends elongate, 304-323 μm long, 15 μm wide; cell wall smooth, colourless (Illustrations of The Japanese Fresh-water Algae, 1977).
170-323 μm long, 15-18 μm wide, L/W=10-20; 4-5 pyrenoids in each chloroplast (Photomicrographs of the Freshwater Algae, vol.3, 1985).

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C. subulatum 235 x 13 μm L/W=18.1 Komado marsh Showa and Tajima Fukushima, 2004

C. subulatum 235-270 μm L/W=11.3 Kabuto-yama Nishi-no-miya Hyogo, 2004

C. subulatum μm L/W= Ochiai-numa 2 Noshiro Akita, 2007

Similar species -->> C. ralfsii (cell wall lined);

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