Section [Margaritiferae]: Cell surface granulated, gnarled or spiny; semicells pyramidal with flattened apex or trapezoid (Illustrations of The Japanese Fresh-water Algae, 1977).
Species (var. subnudum): Cell body (42)-51 μm long, (33.6)-41 μm wide, isthmus 11-(14.5) μm wide, apex slightly depressed; (Illustrations of The Japanese Fresh-water Algae, 1977).

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var. sportella: Large granules present at the center; apex flat
C. sportella var. sportella 37 x 31 μm Yasuji-kawa Sawara Chiba, 2004	C. sportella var. sportella ? 42 x 36 μm USA, 1999
var. subnudum: Granules absent at the center; apex slightly depressed
C. sportella var. subnudum 48 x 38 μm Hiroshima, 1998 Movies	C. sportella var. subnudum 47 x 38 μm Shimo-muneoka Shiki Saitama, 2004	C. sportella var. subnudum 42 x 33 μm Saitama, 1999	C. sportella var. subnudum ? 46 x 41 μm Kuroiso Park Kuroiso Tochigi, 2003
C. sportella var. subnudum ? 45 x 37 μm Koigakubo marsh Tessei-cho Okayama, 2004	C. sportella var. subnudum or v. sportella ? 38 x 34 μm Ikenokochi marsh Tsuruga Fukui, 2004

Similar species -- >> C. vexatum; C. botrytis;

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