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: Cell body elongated, slightly curved, inner side concave, both ends broadly rounded, 150-410 μm long, 10-20 μm wide, L/W=10-18 (cf. C. idiosporum, 220-312 μ, L/W=20-26); 3-11 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).

C. strigosum 80-93 x 6 μm L/W=13-17 Koigakubo marsh Tessei-cho Okayama, 2004	C. strigosum 155-207 x 12-14 μm L/W=14-17 Numa-no-hara m. Madarao highland Niigata, 2006	C. strigosum 157 x 8 μm L/W=19.6 Ohnuma Nasu-shiobara Tochigi, 2006	C. strigosum 138,168 x 8 μm L/W=17,21 Akai wetland Aizuwakamatsu Fukushima, 2005
C. strigosum 150 x 9 μm L/W=16.7 near Imori pond Myoko highland Niigata, 2004	C. strigosum 202-235 x μm L/W=16.1-18.8 Komado marsh Showa and Tajima Fukushima, 2007

Similar species -->> C. idiosporum (220-312 μ, L/W=20-26);

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