Species: 250-(396-576)-790 μm long, 25-(33-84) μm wide; cell body large, slightly curved; both termini tapered; pyrenoids 7-15 in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977). Cell body slightly curved, gradually attenuated toward the truncated ends, which somewhat recurved due to the covexity of the inner margin near the ends; inner margin straight or slightly concave, outer margin convex, 300-500 μm long, 32-50 μm wide, L/W=9-14; cell wall smooth and colorless or sometimes delicately striated and yellowish-brown in color; chloroplasts with ridges containing 7-11 pyrenoids in central row (Photomicrographs of the Freshwater Algae, vol. 1, 1984).

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Cell body small (194-410 μm); L/W=7-11
var. minus ? 363 x 38 μm L/W=9.5 laminae irregular Japan, 1998	var. minus 336 x 42 μm L/W=8 Kisai town Saitama, 2003	var. minus ? 410 x 48 μm 380 x 46 μm L/W=8.5, 8.3 laminae irregular Yamato Kanagawa, 2003	var. minus ? 375 x 61 μm L/W=6 Japan, 1998
C. acerosum var. minus ? 194 μm L/W=10 Japan, 1998	C. acerosum var. minus ? 300 x 40 μm L/W=7.5 Japan, 1999	C. acerosum var. minus ? 253 x 40 μm L/W=6.3 Kozuki Pond Takamatsu Kagawa, 2002	C. acerosum var. minus ? 380 x 46 μm L/W=8.3 Michi-no-eki Tsukiyono Gunma, 2003
C. acerosum var. minus 230 x 37 μm L/W=6.8 History and folk m. Tajima Fukushima, 2004	var. acerosum 205 x 30 μm var. minus L/W=6.8 Todoroki g.l. Kawasaki Kanawaga, 2004	var. minus 282 x 33 μm L/W=8.5 rice field Ichinoseki Iwate, 2005
var. minus cell μm Nasu-shiobara Tochigi, 1998	C. acerosum var. minus ? 280 x 38 μm L/W=7.4 Shimosorimachi Utsunomiya Tochigi, 2006	C. acerosum var. minus ? 484 x 46 μm L/W=10.5 Kitamoto n.o.p. Kitamoto Saitama, 2007

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