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SPIROGYRA 163
scalariform; tubes formed by both cells; reproduction by zygospores
and aplanospores; zygospores ovoid, 29-35 /u ^ 44~73'"'l aplanospores
ovoid, /i. 29-32 X 38-42 /x; median wall punctate, yellow at maturity.
(PI. XXIV, Fig. 5.)
China, Szechwan, November 15, 1933.
46. Spirogyra asiatica Czurda 193 1. Susswasserflora Mitteleu-
ropa. 9, p. 185. 1932.
Vegetative cells 46-51 /x x ioo-i6o;u,, with plane end walls; i chromatophore
(rarely 2); conjugation lateral; tubes formed by both cells;
fertile cells enlarged; zygospores ovoid, 60-65 ju. x 80-120 /a; median spore
wall dark brown, and minutely granulose; suture more or less prom-
inent. (PI. XXIV, Fig. 6.)
Central Tibet, altitude 17,000 feet.
47. Spirogyra lagerheimii Wittrock 1889. In Wittrock and Nord-
stedt Algae Exsiccatae, Nos. 961 and 962. Bot. Notiser
1889. p. 165.
Vegetative cells 25-33^1 x 75-1 50 m, with plane end walls; i chro-
matophore, usually narrow, making .5 to 4 turns; conjugation scalariform
and lateral; tubes formed by both cells; fertile cells cylindric or
enlarged; zygospores ellipsoid with more or less pointed ends, 25-38 /a x
50-100 /a; median spore wall yellowish-brown, finely punctate. (PI.
XXIV, Fig. 7.)
United States: Illinois; Ohio; Massachusetts; New Hampshire.
Sweden; Germany; Latvia; Finland.
In the many collections seen, the chromatophores were uniformly narrow
and formed open spirals.
48. Spirogyra taftiana Transeau 1944. Ohio Jour. Sci. 44, p. 243.
Vegetative cells 18-25 /a ^ 50-96 ;", with plane end walls; i chromatophore,
making 2-4 turns in the cell; conjugation scalariform; tubes
formed by both gametangia; receptive gametangia enlarged or fusi-
form-inflated; sterile cells often bulliform; zygospores ellipsoid, 24-34 /a
x 42-80,11; median wall distinctly and densely punctate; pits more or
less angular, yellow. (PI. XXIV, Fig. 8.)
United States: Texas, Huntsville (Taft Coll.).
Named for C. E. Taft, The Ohio State University, author of many
papers on fresh-water algae.
49. Spirogyra perforans Transeau 1934. Trans. Amer. Micros.
Soc. 53, p. 228, PI. 21, Fig. 57.
Vegetative cells 14-18 ft x 72-120^1, with plane end walls; i chromatophore,
making 3 to 6 turns; conjugation scalariform; tubes formed