SIROGONIUM 235 



United States: Mississippi, Greenville, August, 1945 (L. A. Whitford 

 Coll.). 



India, Fyzabad, Upper Punjab, September-October. 



Differs from S. ventersicum in being larger in all dimensions, and in 

 having a black rather than a brown median spore wall. 



9. SiROGONiuM iLLiNoiENSE (Transcau) G. M. Smith 1933. Fresh- 

 water Algae of the United States, p. 557. Transeau. Amer. 

 Jour. Bot, 1, p. 296, Figs. 1-3. 19 14. 

 Vegetative cells 65-85 /x x 100-310 ft; 6 to 9 chromatophores, nearly 

 straight or making up to i turn in the cell; both gametangia more or 

 less reflexed, the receptive one inflated; zygospores ellipsoid, 85-1 15 ji^ x 

 140-190^1; median wall yellow with scattered protuberances connected 

 by a more or less prominent reticulum. (PI. XL, Figs. 12-13.) 



United States: Originally collected at Lerna, Illinois, from a single 

 prairie pond now destroyed; not found elsewhere in central Illinois during 

 7 years of collecting. Recently collected in eastern Oklahoma by C. E. Taft. 



10. SiROGONiuM Hui (Li) Transcau 1944. Ohio four. Sci. 44, 



p. 244. Bull. Fan Mem. Inst. Biol., Botany. 8, p. 91 (as 

 Spirogyra hui Li). 1938. 



Vegetative cells 82-108 /^ x 140-256 ft, with plane end walls; 5 to 10 

 chromatophores; receptive gametangia inflated to 150ft; zygospores 

 ellipsoid to ovoid, 88-ii5ft x 133-192 ft; outer spore wall thin, colorless; 

 median wall of 2 layers; outer layer thin, irregularly wrinkled; inner 

 layer yellow, verrucose; the inner wall thin and transparent. Akinetes 

 86-92 ft X 64-96 ft are common. (PI. XL, Figs. lo-ii.) 



China, Kiangsi. 



This is the largest species in the genus and the only one with a double 

 median spore wall. Described as a Spirogyra, but the figure is sufficient evi- 

 dence that it should be classified as a Sirogonium. The description has been 

 amended slightly after examination of the type material. 



11. Sirogonium indicum Singh 1938. ]our. Indian Bot. Soc. 17, 



p. 384, Fig. 6B. 



Vegetative cells 65-80 ft in diameter, with approximately 7 chro- 

 matophores which are nearly straight; conjugation scalariform between 

 reflexed gametangia; receptive gametangia greatly inflated; zygospores 

 ellipsoid, y^-^oiJ. x i35-i65ft; median spore wall thick, yellow, and 

 scrobiculate. (PI. XL, Fig, 9.) 



India. 



12. Sirogonium phacosporum Skuja 1949. Nova Acta Soc. Sci. 



Upsali. Ser. 3, 14, p. 103, PI. 22, Figs. 1-5. 



