Species [f. moniliforme]: Cell body 21-56 μm long, 11-29 μm wide, isthmus 4-11 μm wide, L/W=2; semicells spherical; cell wall smooth.
[f. punctata Lagerheim ]: Cell wall dotted; 24-43 μm long, 14-25 μm wide.
[f. elliptica Lagerheim ]: Cell body elongated, semicells broad ellipsoid in shape; 46-50 μm long, 28-32 μm wide.
[f. supyriforme W. et G.S. West ]: Semicells inverted ovoid, apex slightly flatted; 34-56 μm long, 21-23 μm wide.
[f. elongata W. et G.S. Wetst ]: Cell body 2 times longer than f. moniliforme, semicells ellipsoidal; 38-42 μm long, 17-22 μm wide.
[f. pandriforme Heimerl ]: Smaller than f. moniliforme; 17.5-20 μm long, 10-15 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. moniliforme f. moniliforme ? 37 x 20 μm Iroha-numa Zao mountain Yamagata, 2005	C. moniliforme or C. contractum ? 39 x 26 μm Iroha-numa 2 Zao mountain Yamagata, 2006	C. moniliforme f. moniliforme ? μm Kareki-numa Nikko Tochigi, 2008
C. moniliforme f. moniliforme 40.5 x 24 μm Ushidome-ike Norikura highland Nagano, 2006	C. moniliforme f. moniliforme ? 40 x 25 μm Ushidome-ike Norikura highland Nagano, 2006	C. moniliforme f. moniliforme ? 34-39 x 19-24 μm Ushidome-ike Norikura highland Nagano, 2005	C. moniliforme f. elliptica ? μm Ushidome-ike Norikura highland Nagano, 2007
C. moniliforme f. moniliforme ? 47-52 x 29-31 μm Kashibaru marsh 5 Karatsu Saga, 2006	C. moniliforme f. moniliforme ? μm Kashibaru marsh 4 Karatsu Saga, 2008	C. moniliforme f. moniliforme ? 40 x 23 μm USA, 1999	C. moniliforme f. moniliforme ? or f. pandriforme ? 20 x 12 μm Hiroshima, 1998 Movies
C. moniliforme f. pandriforme ? 16 x 8 μm Ishikawa, 2000

Similar species -->> C. contractum (Globuliferae);

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