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176
ZYGNEMATACEAE
spores and 1-2 chromatophorcs. This description obviously disregards all
previous descriptions and exsiccatae.
97. Spirogyra plena (W. & G. S. West) Czurda 1932. Siisswasser-
flora Mittelewopa. 9, p. 193, Ann. Roy. Bot. Gard., Cal-
cutta. 6, p. 187. 1907.
Vegetative cells 38-44 m x 57-88 m, with plane end walls; 2 or 3 chromatophores;
conjugation scalariform and lateral; tubes large and
formed by both gametangia; fertile cells cylindric or enlarged on the
conjugating side; zygospores ovoid, 40-44^1 x 64-73 (-88) /n; median
spore wall yellow, smooth. (PI. XXVIII, Figs. 1-2.)
United States: Iowa; Indiana; Kentucky; Ohio.
Asia, Burma; China, Yunnan; India, Bombay.
98. Spirogyra szechwanensis Jao 1935. Smensia. 6, p. 595, PI. 6,
Fig. 69. Amer. ]our. Bot. 23, p. 55. 1936.
Vegetative cells 75-90 /^ x 125-240 At, with plane end walls; 4 chro-
matophorcs, rarely 2 or 3, making 1-2 turns in the cell; conjugation
scalariform; tubes formed by both gametangia; fertile cells cylindric;
zygospores ellipsoid to ovoid, 57-68 m x 100-210 m; median spore wall
smooth, yellow at maturity. (PI, XXVIII, Fig. 3.)
China, Chungking.
99. Spirogyra jugalis (F1. Dan.) Kiitzing 1845. Phycologia Germanica,
p. 223.
Vegetative cells 75-103 m x 80-300 /x, with plane end walls; 3 to 4
chromatophorcs, making i to 2 turns; conjugation scalariform; tubes
formed by both gametangia; fertile cells cylindric or enlarged; zygo-
spores ovoid, 87-108 /i. x 120-155 /x; median spore wall brown, smooth.
(PI. XXVIII, Fig. 4.)
United States: Minnesota; Iowa; Illinois; Michigan; Massachusetts.
Europe; China.
100. Spirogyra margaritata Wollny 1877. Hedivigia. 16, p. 164.
Vegetative cells ioo-120/x x i50-400iu, with plane end walls; 13 to
15 chromatophorcs, making .25 to .5 turns; conjugation scalariform;
tubes formed by both gametangia; fertile cells cylindric or inflated to
165)".; zygospores ovoid, 92-125/^ x 140-200/1; median spore wall smooth,
brown. (PI. XXVIII, Fig. 5.)
Germany, Dresden.
Thirty years ago Dr. Nordstedt sent me dried material of this species
collected by R. Wollny in 1877, which I assume to be a part of the type
collection. Most of the spores are immature, but are globose only when seen
along the long axis. The above details are based on this collection and
complete the description.