SPIROGYRA 221 



zygospores ellipsoid or sometimes cylindric-ellipsoid, 42-50 /x x 80-1 37 /a; 

 median spore wall of 2 layers, of which the outer is thin, yellow, and 

 wrinkled; the inner coarsely dentate or tuberculate, yellow-brown at 

 maturity. (PL XXXIX, Figs. 14-16.) 



China, Haimen, May 6, 1937. 



Compare with Number 243 and Number 245. 



265. Spirogyra peipingensis }ao 1939. Sinensia. 10, p. 155. 

 Vegetative cells 113-125/^ x (82-) 105-332 /x, with plane end walls; 



chromatophores 5 or 6, making .5 to 2.5 turns in the cell; conjugation 

 scalariform; tubes formed by both cells; receptive gametangia cylindric 

 and shortened; zygospores lenticular, 100-128 a^ x 82-100 m; median spore 

 wall smooth, yellow-brown at maturity. (PL XXXIX, Fig. 20.) 



China, Peiping, December, 1935. 



Belongs near Number 159, S. submaxima Transeau. 



266. Spirogyra sphaerocarpa Jao 1939. Sinensia. 10, p. 156. 

 Vegetative cells 32-40 ^u, x 87-459 /a, with plane end walls; chromato- 

 phores 4 or 5, making .5 to i turn in the cell; conjugation scalariform; 

 tubes formed by both gametangia; receptive gametangia inflated toward 

 the middle up to 75-87 fi; zygospores lenticular, 62-75 /a x 37-57 /a; me- 

 dian spore wall densely punctate, yellow-brown at maturity. (PL 

 XXXIX, Figs. 17-18.) 



China, Wenchow, May 13, 1937. 



Belongs near Number 161, S. bellis (Hassall) Cleve. 



267. Spirogyra subpellucida Jao 1939. Sinensia. 10, p. 157, 

 Vegetative cells 40-45 /a x 62-225 a<^, ^i^h plane end walls; chro- 

 matophores 4 to 7, making .5 to 1.5 turns in the cell; conjugation scalar- 

 iform; tubes formed by both gametangia; receptive gametangia inflated 

 on the outer side only (up to 55-75/^); zygospores lenticular, 55-62iu. x 

 40-42 m; median spore wall smooth, yellow-brown at maturity. (PL 

 XXXIX, Fig. 19.) 



China, Wenchow, May 13, 1937. 



Should be near Number 156, S. pellucida (Hassall) Kiitzing. 



268. Spirogyra macrospora (Rao) Krieger 1944. Rabenhorst's 



Kryptogamenflora. 13, p. 343. 



Vegetative cells 22-25 /a ^ 100-120 /a, with plane end walls; i chro- 

 matophore; conjugation scalariform; receptive gametangia inflated; con- 

 jugating tubes formed by both cells; zygospores ellipsoid with narrow 

 ends, 28-33 /A x 52-73 /a; median spore wall smooth and yellow-brown. 

 (PL XLI, Fig. 18.) 



Germany, Brandenburg; India, Central Provinces. 



