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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50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
Netrium digitus (Ehrenberg) Itzingsohn et Rothe var. digitus: Vegetative cells spindle-shaped, L/W = 3-4, 130-300 μm long, 40-84 μm diam. chloroplasts consist of central axis and 6 radial ridges (Illustrations of The Japanese Fresh-water Algae, 1977).
Netrium digitus var. naegelii (Brébisson) Krieger: Vegetative cells spindle-shaped, L/W = 4-5 100- (124-190) -200 μm long, 25- (28-36) μm diam. (Illustrations of The Japanese Fresh-water Algae, 1977).
Netrium digitus var. lamellosum (Brébisson) Grünblad: Vegetative cells spindle-shaped, L/W = 5-8, 140- (272-416) μm long, 32- (42-59) -60 μm diam. chloroplasts consist of central axis and 6 radial ridges (Illustrations of The Japanese Fresh-water Algae, 1977).
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