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 less than 200 μm long
v. digitus 147-205 μm L/W=2.6-3.8 laminae ? near Karakemi m. Omachi Nagano, 2005	v. digitus 185 x 48 μm L/W=3.9 laminae ? Iyari marsh Omachi Nagano, 2006	v. digitus 169 x 44 μm L/W=3.8 Saitama ?, 1998	v. digitus 169 x 66 μm L/W=2.6 laminae ? Hachimantai mt. Hachimantai Iwate, 2007
v. digitus 164 x 47 μm L/W=3.5 laminae ? Kayoicho-ike Fukuoka, 2001	v. digitus 161 x 44 μm L/W=3.8 4 laminae ? Senuki Nasu Tochigi, 2004	v. digitus 140 x 37 μm L/W=3.8 6 laminae ? Ushidome-ike Norikura highland Nagano, 2005	v. digitus 140 x 37 μm L/W=3.8 4 laminae ? Watasuge marsh Tsugaike highland Nagano, 2005
v. digitus 132, 138 μm L/W=3.5,4.1 laminae ? Omine-numa Tsukiyono Gunma, 2003	v. digitus 152 x 43 μm L/W=3.5 laminae ? Kabuto-yama Nishi-no-miya Hyogo, 2004	v. digitus 165 x 69 μm L/W=2.4 Komado marsh Showa and Tajima Fukushima, 2008	v. digitus 150 x 43 μm L/W=3.5 Komado marsh Showa and Tajima Fukushima, 2004
v. digitus 139 x 39 μm L/W=3.6 Iroha-numa 3 Zao mountain Yamagata, 2006	v. digitus 134 x 36 μm L/W=3.7 laminae ? Kasuga Fukuoka, 2001	v. digitus 126 x 33 μm L/W=3.8 4 laminae ? Shimo-no-koike Shiga highland Nagano, 2005	v. digitus or N. oblongum ? 118 x 32 μm L/W=3.7 4 laminae ? Shimo-no-koike Shiga highland Nagano, 2004
v. digitus 123 x 33 μm L/W=3.7 Miyatoko m.7 Minami-Aizu Fukushima, 2008	v. digitus 133 x 35 μm 126 x 36 μm L/W=3.8,3.5 Shimizu-daira Nasu Tochigi, 2005	v. digitus 122 x 36 μm L/W=3.4 Numa-no-hara m. Madarao highland Niigata, 2006	v. digitus or N. oblongum ? 106,110 x μm L/W=3.0,3.2 4 laminae ? Imou bog Toyohashi Aichi, 2004
v. digitus 115 x 32 μm L/W=3.6 laminae ? Omine-numa Tsukiyono Gunma, 2006	v. digitus 100 x 31 μm L/W=3.2 laminae ? Omine-numa Tsukiyono Gunma, 2007	v. digitus 110 x 36 μm L/W=3.1 Yamamuro m.8 Maibara Shiga, 2008	v. digitus 110 x 30 μm L/W=3.7 Yamamuro m.1 Maibara Shiga, 2008
v. digitus 150 x 47 μm L/W=3.2 Furuike m.1 Iiyama Nagano, 2008

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