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
1998-2008N. 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
1998-2008N. 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
1999-2008N. 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???
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