Species [var. praelongum]: Cell body 380-885 μm long, 11-26 μm, L/W = 22-24; slightly curved but straight at the center, tapered at both ends; curveture reversed at both ends, cell wall finely striated.
[var. brevius Nordstedt ]: Cell body shorter than v. praelongum, 198-360 μm long, 13-24 μm, L/W = 10-22.
[var. porosum (Gutwinski) Krieger ]: Cell body 120-557 μm long, 18-24 μm, L/W = 10-22; cellwall finely dotted, (Illustrations of the Japanese Fresh-Water Algae, 1977).

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var. praelongum: 380-885 μm long
v. praelongum 695 μm L/W=43 Maruyama Park Saitama, 2002	v. praelongum 675 μm L/W=35.5 Japan, 1998	v. praelongum 673 x 19 μm L/W=35.4 Uruguay, 1999	v. praelongum 625 μm L/W=33 Saitama, 1999
v. praelongum 580 μm L/W=38.7 Saitama, 1999	v. praelongum 454 μm L/W=26.7 Ina Saitama, 2003	v. praelongum 430 x 18 μm L/W=23.97 Shimo-muneoka Shiki Saitama, 2004	v. praelongum 404 μm L/W=37 Japan, 1997
v. praelongum 600 x 28 μm 644 x 23 μm L/W=21, 28 Ina town Saitama, 2003	v. praelongum 450 x 15 μm 242 x 14 μm L/W=30, 17 Kodama town Saitama, 2003	v. praelongum 420 x 16 μm L/W=26.2 Mitsumata-numa Kawagoe Saitama, 2005	v. praelongum 466,500 x 24,27 μm L/W= near NTCP Sanmu Chiba, 2006
v. praelongum 390 x 19 μm L/W=20.5 Kitamoto n.o.p. Kitamoto Saitama, 2007	v. praelongum 560 x μm L/W= Okahotto y.m.4 Abiko Chiba, 2008	v. praelongum 460 x μm L/W= Okahotto y.m.5 Abiko Chiba, 2008	v. praelongum 315 x μm L/W= Okahotto y.m.2 Abiko Chiba, 2008
v. praelongum 460 x μm L/W= Nogyo Fureai p. Toride Ibaraki, 2008
var. brevius: 198-360 μm long
v. brevius ? 360 x 13 μm L/W=27.7 Watarase Wetland Fujioka Tochigi, 2005	v. brevius ? 342 x 15 μm L/W=22.8 Oyachi marsh Iizuna-kogen Nagano, 2006	v. brevius 316 x 18 μm L/W=17.6 Ishizaka Hatoyama Saitama, 2004	v. brevius 266 x 13 μm L/W=20.5 Sano Hakuba Nagano, 2004
v. brevius 210 x 13 μm L/W=20.5 Kamishiro Hakuba Nagano, 2004
var. porosum: Cell wall dotted; cell body slightly curved
v. porosum 420 μm L/W=18 USA, 1999

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