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220 ZYGNEMATACEAE
subglobose, 41-48/i x 41-67/Li, with similarly marked walls. (PI.
XXXIX, Figs. lo-ii.)
China, Szechwan, November 11, 1933.
SPECIES DESCRIPTIONS NOT IN PROPER SEQUENCE
261. Spirogyra pseudogranulata Ley 1944. Si?jensia. 15, p. 99.
Vegetative cells 36-40 /i x 152-378/1, end walls replicate; chromato-
phores 2; conjugation lateral; tubes formed by both gametangia; recep-
tive gametangia enlarged or inflated; zygospores ovoid, 46-68 /x x
100-140/M; median spore wall of 2 layers; the outer thick, irregularly
corrugate; the inner minutely reticulate, yellow-brown. (PI. XXXIX,
Fig- 9-)
China, Tong-Kau, Kwangtung, March 10, 1942.
Should be compared with Number 259, S. granulata Jao.
262. Spirogyra jaoi Ley 1944. Sine?isia. 15, p. 99.
Vegetative cells 19-22 /.i x 64-216^^, end walls replicate; i chromatophore;
conjugation scalariform; tubes formed by both gametangia,
receptive gametangia inflated; zygospores ovoid, 28-40 /x x 54-90 m;
median spore walls of 2 layers; the outer thin and wrinkled; the inner
smooth, yellow at maturity. (PI. XXXIX, Fig. 12.)
China, Tong-Kau, Kwangtung, February 17, 1942.
Belongs near Number 225, S. laxistrata Jao, from which it differs in the
characteristics of the median spore wall, and in the formation of the con-
jugating tubes.
263. Spirogyra chekiangensis Jao 1939. Smeiisia. 10, p. 152.
Vegetative cells 25-28 ju. x 100-200 /a, with plane end walls; i chromatophore,
making 1-2 turns in the cell; conjugation scalariform; tubes
formed by both gametangia; receptive gametangia enlarged; zygospores
ovoid, 45-48/^ x 85-88 ;u; median spore wall of 2 layers, of which
the outer is thin, irregularly wrinkled and yellow; the inner coarsely
and irregularly reticulate, yellow-brown at maturity. (PI. XXXIX,
Fig- 13-)
China, Wenchow.
Compare with Number 45, S. obovata jao, which has somewhat similar
vegetative cells but much larger zygospores, and single-layered median
spore wall.
264. Spirogyra crassispina Jao 1939. Sinensia. 10, p. 153.
Vegetative cells 30-35 /a x 326-351 /u, with rephcate end walls; chromatophores
2, making i to 3.5 turns in the cell; conjugation lateral and
scalariform; tubes formed by both cells; receptive gametangia enlarged;