SPIROGYRA i8i 



is thin, brownish and wrinkled, the inner, brown, and irregularly retic- 

 ulate. (PI. XXIX, Figs. 1-2.) 



China, Chungking, August, 1930. 



118. Spirogyra orientalis W. & G. S. West 1907. Ann. Roy. Bot. 



Gard., Calcutta. 6, p. 186. 



Vegetative ceils 30-31 /^ x 90-1 60 /x, with plane end walls; 3 chro- 

 matophores, making i to 1.5 turns; conjugation scalariform; tubes 

 formed by both gametangia; fertile cells inflated, 57-65/^; zygospores 

 ellipsoid, more or less pointed, 38-42^1 x 61-67 /a; niedian spore wall 

 minutely scrobiculate, brown. (PI. XXIX, Fig. 3.) 



United States: Michigan, Cheboygan County (Taft Coll.). 



Burma; China, Yunnan (Li Coll.). 



119. Spirogyra subcylindrospora Jao 1935. Sinensia. 6, p. 598, 



PL 7, Figs. 79-80. 



Vegetative cells 25-32 ju x 96-228 /a, with plane end walls; 2 to 3 

 (rarely 4) chromatophores, making i to 1.5 turns in the cell; conjuga- 

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

 dric or enlarged; zygospores ellipsoid to cylindric-ellipsoid with 

 rounded ends, 32-38 ju. x 58-96 /x; median spore wall brown, thick, retic- 

 ulate. (PI. XXIX, Figs. 4-5.) 



United States: Florida (Tiffany Coll.). 



China, Szechwan. 



120. Spirogyra castanacea G. C. Couch 1944. Ohio Jour. Set. 



44, p. 277. 



Vegetative cells 34-37 M x 100-173 /x, ^^^^ plane end walls; 2 to 3 

 chromatophores, making 2 to 3 turns in the cell; conjugation scalar- 

 iform; tubes formed by both gametangia; receptive cell inflated on both 

 sides; zygospores mostly broadly ellipsoid, rarely ovoid, 48-52 /x x 

 69-73 /x; median spore wall chestnut brown, strongly reticulate. 



United States: Arkansas, Boston Mountain region. 



121. Spirogyra mienningensis Li 1940. Bull. Fan Mem. Inst. 



Biol., Botany. 10, p. 61. 



Vegetative cells 42-48 p. x 102-208 m, with plane end walls; chro- 

 matophores 2 or 3, making 1-4 turns in the cell; conjugation scalar- 

 iform; tubes formed by both gametangia; fertile cells inflated up to 

 74 m; zygospores ellipsoid, 52-59 /a x 70-88 jU.; outer spore wall of 2 layers, 

 the outermost thin, smooth, transparent; the inner, thin and wrinkled; 

 median spore wall granulose to verrucose, yellow-brown at maturity. 

 (PI. XXIX, Fig. 6.) 



China, Yiinnan, Mienning, December 10, 1938. 



