Species [var. digitus]: Cell body 130-300 μm long, 40-84 μm wide, L/W = 3-4; cell wall smooth.
[var. lamellosum]: Longer than v. digitus, both sides parallel; cell body 140-416 μm long, 32-60 μm wide, L/W = 5-8.
[var. naegelii]: Smaller than v. digitus, both ends broadly rounded; cell body 100-200 μm long, 25-36 μm wide, L/W = 4-5.
[var. rectum]: Larger than v. digitus, tapered to both ends; cell body 300 μm long, 48 μm wide, L/W = 6.3 (Illustrations of The Japanese Fresh-water Algae, 1977).

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N. digitus var. digitus, L/W=3-4
Cell body more than 200 μm long
v. digitus 295 x 80 μm 296 x 84 μm L/W=3.7 Komado marsh Showa and Tajima Fukushima, 2004	v. digitus 210 x 75 μm L/W=2.8 Mizunashi-Yachi Komado marsh Fukushima, 2007	v. digitus 205-238 x μm L/W=3.4-3.8 Shirakaba-Yachi Komado marsh Fukushima, 2007	v. digitus 202 x 72 μm L/W=2.8 Miyatoko m.5 Minami-Aizu Fukushima, 2008
v. digitus ? 282 x 72 μm L/W=3.9 6 laminae ? Kawaguchi Natural p. Kawaguchi Saitama, 2005	v. digitus 260 x 70 μm L/W=3.7 laminae ? Karakemi marsh Yasaka Nagano, 2005	v. digitus 253 x 65 μm L/W=3.9 laminae ? U.S.A.?, 1999
v. digitus 235 x 70 μm L/W=2.9-3.0 Oze-ga-hara Katashina Gunma, 2006	v. digitus 200-202 x 70-75 μm L/W=2.7-2.9 Midagahara 5 Tateyama Toyama, 2006	v. digitus 230 x 80 μm L/W=2.9 Midagahara 2 Tateyama Toyama, 2006
v. digitus 205 x 67 μm L/W=3.1 Chigo-ike 2 Shiga highland Nagano, 2006	v. digitus 245 x 85 μm L/W=2.9 Chigo-ike Shiga highland Nagano, 2008	v. digitus 270 x 69 μm L/W=3.9 Chigo-ike Shiga highland Nagano, 2008
v. digitus 202-211 x μm L/W=2.9-3.0 6 laminae ? Tanohara Natural p. Ontake highland Nagano, 2005	v. digitus 200 x 64 μm L/W=3.1 laminae ? Yoshigadaira marsh Shirane mountain Gunma, 2005	v. digitus 230 x 75 μm L/W=3.1 laminae ? Yumi-ike Shirane mountain Gunma, 2005	v. digitus 205-247 x μm L/W=3.0-3.6 laminae ? Kisuge konuma Shimogo Fukushima, 2005
v. digitus 180-209 μm L/W=2.9-3.2 laminae ? Ukishima marsh Tsugaike highland Nagano, 2005	v. digitus 242 x 77 μm L/W=3.1 Ukishima marsh Tsugaike highland Nagano, 2006	v. digitus 184 x 60 μm 230 x 67 μm L/W=3.1,3.4 J Skunk Cabbage m. Tsugaike highland Nagano, 2006	v. digitus 238 x 71 μm L/W=3.4 Kamino-tanbo Tsugaike highland Nagano, 2006
v. digitus 188, 248 x μm L/W=3.1, 3.2 laminae ? Ushidome-ike Norikura highland Nagano, 2005	v. digitus 227 x 80 μm 288 x 84 μm L/W=2.8,3.4 Kenashitai Hakkoda mountain Aomori, 2005	v. digitus 227-280 μm L/W=3.4-3.7 Kenashitai Hakkoda mountain Aomori, 2005	v. digitus 275,290 x μm L/W=3.3 Kami-Kenashitai 3 Hakkoda mountain Aomori, 2006
v. digitus or v. naegelii ? 213 x 55 μm L/W=3.9 6 laminae ? Omine-numa Tsukiyono Gunma, 2003	v. digitus 280 x 88 μm L/W=3.2 Ikenokochi m.5 Tsuruga Fukui, 2006	v. digitus 268 x 82 μm L/W=3.3 Sukawa highland Kurikoma mt. Akita, 2007
v. digitus 300 x 84 μm L/W=3.6 East of Tojuro Azuma mt. Yamagata, 2007	v. digitus 195,200 x μm L/W=2.9,3.2 East of Tojuro Azuma mt. Yamagata, 2007	v. digitus 300 x 84 μm L/W=3.6 Yahei-daira 1 Azuma mt. Yamagata, 2007	v. digitus 271-296 x μm L/W=2.6-3.2 Iroha-numa Azuma mt. Yamagata, 2007
v. digitus 220 x 64 μm L/W=3.4 Yamamuro m.1 Maibara Shiga, 2008	v. digitus 290 x 81 μm L/W=3.6 Sensho-ga-hara Shizukuishi Iwate, 2007	v. digitus 253 x 94 μm L/W=2.7 Sensho-ga-hara Shizukuishi Iwate, 2007

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