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2o6 ZYGNEMATACEAE
United States: Iowa and Missouri eastward to New Jersey.
Europe; Australia; China.
This includes the variant described by Czurda (1930) as S. grevilleana
(Hassall) Czurda.
211. Spirogyra chuniae Jao 1935. Sinensia. 6, p. 609, PI. 10,
Fig. 105.
Vegetative ceils 28-39/1 x 67-130/^, with replicate end walls; i chro-
matophore, in some cells 2, making 2 to 5.5 turns in the cell; fertile cells
inflated; reaching a diameter of 8oiu.; conjugation scalariform; tubes
very short, sometimes formed only by the male gametangia; zygospores
median spore wall yel-
ellipsoid with pointed ends, S5~43/^ ^ 70-1 19 a*,;
low, smooth. (PI. XXXVI, Fig. i.)
China, Chungking.
212. Spirog\tia incrassata Czurda 1930. Beih. Bot. Zentralbl.
47, p. 38, Fig. 10.
Vegetative cells 26-30 /j. x 200-250 /x, with replicate end walls; (i-)
2 chromatophores; conjugation lateral and scalariform; tubes formed
by both cells; fertile cells greatly inflated toward the middle; zygo-
spores ellipsoid, 42-52 /t x no/'.; median spore wall yellow-brown, irreg-
ularly punctate, and inwardly channeled. (PI. XXXVI, Figs. 2-4.)
Germany, Berlin.
213. Spirogyra rugosa (Transeau) Czurda 1932. Siisswasserflora
Mitteleuropa. 9, p. 156. Amer. Jour. Bot. 1, p. 291. 19 14.
Phycoth. Bor.-Amer., No. 456 (as S. tenuissima var.
rugosa).
Vegetative cells 10-13/A x 50-210/1, with replicate end walls; i chro-
matophore, making 2 to 6 turns; conjugation lateral and scalariform;
tubes formed by both gametangia; fertile cells greatly inflated toward
the middle; zygospores ellipsoid, 28-32/1 x 55-66 /t; median spore wall
yellow-brown, minutely scrobiculate.
United States: Iowa; Illinois; Massachusetts; Rhode Island; New Jersey.
214. Spirogyra foveolata (Skuja) Czurda 1932. Siisswasserflora
Mitteleuropa. 9, p. 157. Skuja. Acta Horti Bot. Univ.
Latviensis. 3, p. 107. 1928. Not S. inftata var. foveolata
Transeau 1914 (see No. 216).
Vegetative cells 11-16/A x 90-250/1, with replicate end walls; i chro-
matophore, making 3 to 10 turns in the cell; conjugation usually lateral,
sometimes scalariform, with the tubes formed mostly by the male gam-
etangia; fertile gametangia inflated to 30-45/1 toward the middle; zygo-