Genus: Cell body usuall large, spindle or cylindroid in shape, rounded at both ends; two chloroplasts star-shaped in cross-section, consisting of a central rod and radially arranged dented laminae (Illustrations of The Japanese Fresh-water Algae, 1977).

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N. digitus var. digitus, L/W=3-4; Spindle-shaped (or Rhomboidal)
Longer than 200 μm		Shorter than 200 μm
N. digitus v. digitus 35 samples 200-296 μm L/W=2.8-3.9 1998-2008	N. digitus v. digitus 35 samples 200-296 μm L/W=2.8-3.9 1998-2008	N. digitus v. digitus 25 samples 106-205 μm L/W=2.6-4.1 1998-2008	N. digitus v. digitus 25 samples 106-205 μm L/W=2.6-4.1 1998-2008
N. digitus var. digitus, L/W=3-4; Ellipsoidal, close to N. oblongum
N. digitus v. digitus 16 samples 118-296 μm L/W=2.9-3.9 1998-2008	N. digitus v. digitus 16 samples 118-296 μm L/W=2.9-3.9 1998-2008
N. digitus var. naegelii, L/W=4-5		N. digitus var. lamellosum, L/W=5-8
N. digitus v. naegelii 23 samples 145-300 μm L/W=4.1-5.0 1999-2008	N. digitus v. naegelii 23 samples 145-300 μm L/W=4.1-5.0 1999-2008	N. digitus v. lamellosum 12 samples 155-350 μm L/W=4.6-5.8 1999-2008	N. digitus v. lamellosum 12 samples 155-350 μm L/W=4.6-5.8 1999-2008
N. interruptum and N. oblongum
N. oblongum 26 samples 97-235 x μm L/W=3.2-4.2 2005-2008	N. oblongum 26 samples 97-235 x μm L/W=3.2-4.2 2005-2008	N. interruptum v. interruptum 205 x 41 μm L/W=5.0 Kowashimizu Suwa Nagano, 2007	N. interruptum v. minor ? 72-90 x 18-19 μm L/W=3.6-5.0 Numa-no-hara m. Madarao highland Niigata, 2005
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N. pseudactinotaenium 2 samples 32-37 μm Yamagata, 2005-7	N. digitus a dividing cell 388 x 68 μm L/W=5.7 Nasu Tochigi, 2000	N. digitus a dividing cell Nasu Tochigi, 2000

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