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 more than 40 μm in width
var. acerosum 40 samples 197-692 μm L/W=7.5-14.2 1998-2007	var. acerosum 40 samples 197-692 μm L/W=7.5-14.2 1998-2007	var. acerosum 40 samples 197-692 μm L/W=7.5-14.2 1998-2007	var. acerosum 40 samples 197-692 μm L/W=7.5-14.2 1998-2007
Cell body 20-40 μm in width
var. acerosum 13 samples 206-560 μm L/W=12-16 1999-2006	var. acerosum 13 samples 206-560 μm L/W=12-16 1999-2006	var. acerosum 13 samples 206-560 μm L/W=12-16 1999-2006	var. acerosum 13 samples 206-560 μm L/W=12-16 1999-2006
Cell body small (194-410 μm); L/W=7-11
var. minus ? 14 samples 194-484 μm L/W=6-10 1998-2007	var. minus ? 14 samples 194-484 μm L/W=6-10 1998-2007	var. minus ? 14 samples 194-484 μm L/W=6-10 1998-2007	var. minus ? 14 samples 194-484 μm L/W=6-10 1998-2007
Cell body long (388-915 μm), central region nearly straight; L/W=15-33
var. elongatum 21 samples 303-892 μm L/W=17-23 1998-2008	var. elongatum 21 samples 303-892 μm L/W=17-23 1998-2008	var. elongatum 21 samples 303-892 μm L/W=17-23 1998-2008	var. elongatum 21 samples 303-892 μm L/W=17-23 1998-2008
Inner side slightly convexed (336-494 μm); L/W=8-12
var. tumidum ? 312 x 19 μm L/W=16 laminae irregular Saitama, 1999

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