Species: [var. calosporum] Cell body well curved, inner side straight or concave,
tapered toward both ends, truncated with slanted edges (cf. C. parvulum);
small pores present at outside of the ends;
70-(95-110)-116 μm long, 8-(12-13) μm wide, L/W=7-10
(cf. C. dianae);
3-5 pyrenoids in each chloroplast; cell wall smooth or brownish in color.
[var. brasiliense] Slender than var. calosporum,
90-(126-150)-195 μm long, 5-(8)-11 μm wide, L/W=12-16
[var. maius] Larger than var. calosporum, curvature small,
120-(176)-192 μm long, 13-(17)-18 μm wide, L/W=11-12
(Illustrations of The Japanese Fresh-water Algae, 1977).
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