Species [ var. ulna ]: Cell body slightly curved, both lateral margins parallel, slightly tapered toward ends, both ends broadly truncated, 170-(192-462)-500 μm long, 10- (11-22)-23 μm wide, L/W=15-20; cell wall brownish in color, striated (10-11/10 μm), bands present; 6-15 pyrenoids in each semicell.
[ var. recurvatum ]: Thinner than var. ulna, recurved at both ends, 248-(298)-345 μm long, 9-11-(18) μm wide, L/W=30; cell wall smooth without striae (Illustrations of The Japanese Fresh-water Algae, 1977).

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v. ulna 396 x 16 μm L/W=24.8 Shimo-no-koike Shiga highland Nagano, 2005	v. ulna 325 x 17 μm L/W=19.1 Midagahara Tate-yama (mt) Toyama, 2006	v. ulna 312 x 15 μm L/W=20.8 Mida-ga-hara Gassan (mt) Yamagata, 2006	v. ulna 284 x 16.5 μm L/W=17.2 Shimo-no-koike Shiga highland Nagano, 2004
v. ulna or C. subscoticum ? 230 x 11 μm L/W=20.9 Ko-numa Tsukiyono Gunma, 2003	v. ulna or C. subscoticum ? 222 x 13 μm L/W=17.1 Suiren-numa Hakkoda mountain Aomori, 2005	v. ulna 213 x 16 μm L/W=13.3 Kenashitai Hakkoda mountain Aomori, 2005	v. ulna 317,360 x 15,17 μm L/W= Kami-Kenashitai Hakkoda mountain Aomori, 2006
v. ulna 285 x 17 μm L/W= Shimo-Kenashitai Hakkoda mountain Aomori, 2006	v. ulna or v. recurvatum ? 195 x 11 μm Kitayama park Nishi-no-miya Hyogo, 2004	v. recurvatum ? 112 x 8 μm L/W=14 Kejo-numa Furukawa Miyagi, 2003
v. ulna μm L/W= Hachiman-numa m2 Hachimantai Iwate, 2007	v. ulna μm L/W= Hachiman-numa m3 Hachimantai Iwate, 2007	v. ulna μm L/W= Mitsuishi m.2 Hachimantai Iwate, 2008
v. ulna 340 x 14 μm L/W=24.2 Kareki-numa Nikko Tochigi, 2008	v. ulna 392 x 20 μm L/W=19.6 Kareki-numa Nikko Tochigi, 2008

Similar species -->> C. angustatum; C. toxon (cell wall smooth); C. praelongum;

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