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; type B: both ends rounded
Cell body more than 200 μm long
v. digitus or N. oblongum ? 218 x 68 μm L/W=3.2 Tanohara marsh Shiga highland Nagano, 2004	v. digitus or N. oblongum ? stock Nsht-2 205-243 x 75-78 μm L/W=2.7-3.1 Tanohara marsh Shiga highland Nagano, 2004	v. digitus or N. oblongum ? 208 x 66 μm L/W=3.2 Nagori-ga-hara Sukawa highland Kurikoma mountain Iwate, 2005	v. digitus ? or N. oblongum ? 208 x 66 μm L/W=3.5 Ohnigo marsh Sukawa highland Kurikoma mountain Iwate, 2005
v. digitus ? or N. oblongum ? 210 x 66 μm L/W=2.7-3.6 Tashirodaira m Hakkoda mountain Aomori, 2006	v. digitus ? or N. oblongum ? 222 x 68 μm L/W=3.3 Hakkoda Gourd L. Hakkoda mountain Aomori, 2006	v. digitus ? or N. oblongum ? 160-207 x 58-61 μm L/W=2.7-3.6 Shimizu-daira Nasu Tochigi, 2005	v. digitus 193-220 x 61-65 μm L/W=3.2-3.4 near Hyoutan-ike Uba-ga-daira Nasu Tochigi, 2006
v. digitus 202 x 63 μm L/W=3.2 Ryugahara m.5 Yuri-Honjo Akita, 2008	v. digitus 213, 252 x μm L/W=3.2, 3.5 Shijuhachi-ike Shiga highland Nagano, 2006	v. digitus ? or N. oblongum ? 203 x 64 μm 227 x 74 μm L/W=3.2, 3.1 Karakemi marsh Yasaka Nagano, 2005	v. digitus ? or N. oblongum ? 275 x 70 μm L/W=3.9 Karakemi m.8 Yasaka Nagano, 2007
Cell body less than 200 μm long
v. digitus or N. oblongum ? 195 x 63 μm L/W=3.1 Tanohara marsh Shiga highland Nagano, 2004	v. digitus or N. oblongum ? 196 x 68 μm L/W=2.9 Hachiman-numa Hachimantai Iwate, 2006	v. digitus or N. oblongum ? 198 x 70 μm L/W=2.8 Kareki-numa Nikko Tochigi, 2008	v. digitus or N. oblongum ? 182 x 65 μm L/W=2.8 ??? ???, 2004

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