Species [ var. angulosum ]: Cell body small, 14-31 μm long, 12.6-21 μm wide, L/W=1.5, isthmus 3.4-6 μm wide; semicells quadrate or hexagonal in shape.
[ var. concinnum ]: Smaller than var. angulosum, (11-12)-13 μm long, 8-12 μm wide, L/W=1.3, isthmus 2.6-4.5 μm wide (Illustrations of the Fresh-water Algae, 1977).

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C. angulosum ? 40 x 28 μm Saitama, 1999	C. angulosum or C. rectangulare ? 37 x 28 μm Ishinazaka Furukawa Miyagi, 2003	C. angulosum ? 26 x 14 μm Ibaraki, 2000	C. angulosum v. angulosum 20 x 17 μm 22 x 18 μm rice field Ichinoseki Iwate, 2005
C. angulosum v. angulosum 17 x 13 μm Saitama, 1999	C. angulosum v. angulosum 14 x 11 μm Chiba-Minato Park Chiba, 2003	C. angulosum v. angulosum 29 x 17 μm Near Omine-numa Minakami Gunma, 2008	C. angulosum v. concinnum 14 x 12.5 μm Tane-ike Togakushi highland Nagano, 2005

Similar species -- >> C. rectangulare; C. sexaugulare;

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