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222 ZYGNEMATACEAE
269. Spirogyra iNDicA Kficgcr 1944. Rabenhorst's Kryptogamen-
flora. 13, p. 317.
Vegetative cells 36-42^ x iio-152/i, with plane end walls and i
chromatophore; conjugating tubes formed by both gametangia; conjugation
mostly lateral, less frequently scalariform; receptive gametangia
cylindric; zygospores ovoid, 33-^S/x x 40-62 /a; median spore wall thick,
smooth, and brown. (PI. XLI, Figs. 20-21.)
India, Central Provinces; South America, south Chile.
270. Spirogyra czurdae Misra 1937. Proc. Indian Acad. Sci. 5,
p. 115, Fig. 3.
Vegetative cells 26-28 m x 52-78 /a, with plane end walls and i chromatophore;
conjugation scalariform; tubes formed by both gametangia;
receptive gametangia shortened and enlarged; zygospores globose,
^^-54/^ in diameter; median spore wall very thick, brown, and scrobic-
ulate; pits 3-4 /j. in diameter. (PI. XLI, Figs. lo-ii.)
India, Kashmir.
271. Spirogyra sibirica Skvortzof 1927. ]oHr. Bot. 65, p. 252,
Fig. I.
Vegetative cells about 17/1 broad, with plane end walls and i chromatophore;
conjugation scalariform; tubes formed by male cells; recep-
tive gametangia inflated slightly on the inner side; many sterile cells
bullate; zygospores ellipsoid, 20 /a x 32-40 /a; median spore wall yellow,
scrobiculate. (PI. XLI, Figs. 8-9.)
Russia, Western Altai Mountains, Zaisan district.
272. Spirogyra atasiana Czurda 1939. Arch. f. Hydrobiol. Suppl.
Bd. 16, p. 417, PI. I, Fig. 3.
Vegetative cells 44-48 /x x 92-161 m, with plane end walls and i chromatophore;
conjugation scalariform; tubes formed apparently by the
male gametangia; receptive gametangia cylindric; zygospores ovoid,
41-45/ji X 50-90 /t; median spore wall thick, yellow-brown, outer surface
granulose.
Sumatra, Danau di Atas.
273. Spirogyra pseudoreticulata Kriegcr 1944. Rabenhorst's
Kryptogamenflora. 13, p. 400.
Vegetative cells 20-25 /x x 75-170 ^n, with plane end walls and 2 chromatophores;
conjugation lateral and scalariform; tubes formed by both
cells; receptive gametangia enlarged; zygospores ellipsoid, 30-33 m x
64-68 A^; median spore wall brown, with rather fine, irregular, reticulate
ridges. (PI. XLI, Figs. 13-15.)
Brazil, Sao Paulo.