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Gamophyceae: Desmidales: Mesotaeniaceae
(Charophyceae: Zygnematales: Mesotaeniaceae)

 Netrium digitus
(Nägeli) Itzigsohn et Rothe var. naegelii (Brébisson) Krieger

Netrium digitus 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).

Netrium digitus var. naegelii (Brébisson) Krieger (or N. oblongum ?), cell body 245 μm long, 60 μm wide, L/W=4.1, x 400, x 640, Hyoutan-ike (gourd pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 19, 2005 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Netrium digitus Netrium digitus Netrium digitus Netrium digitus Netrium digitus
Cell body (slightly flattened by pressing with coverglass ?) 179 μm long, 72 μm wide, L/W=2.5, x 400, x 640
Netrium digitus Netrium digitus Netrium digitus

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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