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1 62 ZYGNEMATACEAE
41. Spirogyra occidentalis (Transeau) Czurda 1932. Siisswasser-
flora Mitteleuropa. 9, p. 183.
Vegetative cells 40-50^ x 125-300/^, with plane end walls; chromatophores
i, 2, or 3, making 2 to 6 turns in the cell; conjugation
scalariform; tubes formed by both gametangia; fertile gametangia
cylindric or inflated to 66/^; zygospores ovoid to cylindric-ovoid,
36-56/n X 57-105/^; median spore wall smooth, yellow-brown; outer
wall of 2 layers, of which the inner is hyaline, scrobiculate. (PI. XXIV,
Fig. 2.)
United States: Iowa; Illinois; Indiana; Ohio; Kentucky.
Canada, British Columbia (Phycoth. Bor.-Amer., No. 961).
Resembles S. velata but has larger dimensions throughout.
42. Spirogyra luteospora Czurda 1932. Susswasserflora Mittel-
europa. 9, p. 181.
Vegetative cells 22-24 /i ^ 55~90'^» w'wh plane end walls; i chromatophore;
conjugation scalariform; tubes formed by both gametangia;
fertile cells cylindric or enlarged by the spores; zygospores ovoid to
cylindric-ovoid, 25-26^1 x 38-46/Li; median spore wall golden-brown,
scrobiculate; pits about 2/^ in diameter. (PI. XXIV, Fig. 3.)
Bohemia.
43. Spirogyra sulcata Blum 1943. Amer. Jour. Bot. 30, p. 783,
Figs. 9-11.
Vegetative cells ^7-46 m x 50-160 ju,, with plane end walls; i(-2)
chromatophores, with prominent median furrow, making 2 to 5 turns
in the cells; conjugation scalariform; tubes formed by both gametangia;
fertile cells inflated on the outer side; zygospores ovoid, 43-46111 x 52-
62 fj.; median spore wall thick, brown, and reticulate. (PI. XXIV, Fig. 4.)
United States: Wisconsin, Madison.
44. Spirogyra westii Transeau 1934. Trans. Amer. Micros. Soc.
53, p. 224. S. porticalis var. ajricana G. S. West 1907.
]our. Linn. Soc. of London Bot. 38, p. 105.
Vegetative cells 40-41 /i x 60-160/'., with plane end walls; i chromatophore,
making 3 to 5 turns in the cell; conjugation scalariform;
tubes formed by both gametangia; fertile cells enlarged; zygospores
ovoid, about 58 /x x /a;
93 median spore wall finely wrinkled, or corrugate.
Africa, Tanganyika.
45. Spirogyra obovata Jao 1935. Sinensia. 6, p. 596, PI. 7, Fig. 73.
Vegetative cells 25-29/A x 70-182/1, with plane end walls; i chromatophore
(rarely 2), making 2.5-6 turns in the cell; conjugation