SPIROGYRA 219 



iform; tubes formed by both gametangia; fertile cells enlarged or in- 

 flated; zygospores ovoid, 39-45 /x x 60-90 fi, yellow-brown; median wall 

 reticulate. (PI. XXXVII, Figs. 11-12.) 

 Finland. 



The description does not state whether the median wall is single or 

 double. It is included here as a species closely related to the preceding and 

 characterized by smaller spores and a definite number of chromatophores. 



258. Spirogyra crassivallicularis Jao 1935. Trans. Amer. Micros. 



Soc. 54, p. 2, PL I, Fig. 4. 



Vegetative cells 54-58 ft x 168-420 ft; end walls replicate; chromato- 

 phores usually 4, rarely 3, making 1.5 to 3.5 turns in the cell; conjuga- 

 tion scalariform; tubes formed by both gametangia; fertile cells en- 

 larged, or inflated up to 80 /x; zygospores ovoid, 52-71 /x x 90-144 /x; 

 median wall of 2 layers, of which the outer is thin, wrinkled, and yel- 

 low; the inner thick, yellow-brown and reticulate with thick irreg- 

 ularly crenulate ridges. (PI. XXXIX, Fig. 6.) 



United States: Massachusetts, Woods Hole. 



259. Spirogyra granulata Jao 1935. Sinensia. 6, p. 613, PI. 11, 



Figs. 1 16-17. 



Vegetative cells 32-35 i". x 147-280 /ti, with replicate end walls; 2 

 chromatophores, making 2.5 to 6 turns in the cell; conjugation lateral; 

 tubes formed by both gametangia; receptive gametangia enlarged to- 

 ward the middle; zygospores ovoid to cylindric-ovoid, 45-55/^^ x 93-131 /x; 

 median wall double, of which the outer layer is thin and irregularly 

 wrinkled; the inner, granulate and slightly wrinkled, yellowish-brown. 

 (PL XXXIX, Figs. 7-8.) 



China, Szechwan, December, 1933. 



See also Number 261, .S. pseudogranulata Ley. 



260. Spirogyra quinquelaminata Jao 1935. Sinensia. 6, p. 615, 



PL II, Figs. 121-22. 



Vegetative cells 41-45^1 x 154-280 /x, with replicate end walls; 2 

 chromatophores, making 2 to 4 turns in the cell; reproduction by zygo- 

 spores and aplanospores; conjugation scalariform; tubes formed by both 

 gametangia; fertile cells enlarged toward the middle; sterile cells some- 

 times inflated up to 70 /x; zygospores ovoid, 51-55 M x 83-144^1, with 5 

 layers in the spore wall; outer spore wall of 2 layers, of which the outer 

 is thin and colorless; the inner up to 3.5 ju. in thickness and distinctly 

 lamellate; median spore wall yellow-brown, also of 2 layers, of which 

 the outer is thin and somewhat wrinkled; the inner, coarsely and irreg- 

 ularly reticulate, the ridges being crenulate to dentate; aplanospores 



