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 chroma- 

 tophore; 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 chro- 



matophore, making 1-2 turns in the cell; conjugation scalariform; tubes 

 formed by both gametangia; receptive gametangia enlarged; zygo- 

 spores 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; chro- 



matophores 2, making i to 3.5 turns in the cell; conjugation lateral and 

 scalariform; tubes formed by both cells; receptive gametangia enlarged; 



