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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Inner side slightly concaved; L/W=7-14
Cell body 20-40 μm in width
var. acerosum 508 x 37.5 μm L/W=13.5 Koaze river Saitama, 2002	var. acerosum 508 x 32 μm L/W=16 Saitama, 2000	var. acerosum 363 x 36 μm L/W=10.1 Saitama, 1999
var. acerosum 314 x 34 μm L/W=9.2 Motoyurugi Fujioka Gunma, 2004	var. acerosum 206 x 38 μm L/W=5.4 ? Saitama, 1999	var. acerosum ? 560 x 34 μm L/W=16.5 Yamato Kanagawa, 2003	var. acerosum ? 530 x 35 μm L/W=15 Ina town Saitama, 2003
var. acerosum 450 x 34 μm 475 x 34 μm L/W=13, 14 Saitama, 1999	var. acerosum 470 x 37 μm L/W=12.7 Akasaka-numa Iwatsuki-ku Saitama, 2006	var. acerosum 388 x 38 μm L/W=10.2 Akasaka-numa Iwatsuki-ku Saitama, 2006	var. acerosum 338 x 33 μm L/W=11.8 Saitama, 2001
var. acerosum 334 x 27 μm L/W=12.4 Nanbata castle p. Fujimi Saitama, 2004	var. acerosum 338 x 28 μm L/W=12.1 Kaga Ishikawa, 2000

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