i8o ZYGNEMATACEAE 



114. Spirogyra schmidtii W. & G. S. West 1902. Bot. Tidsskrift. 



24, p. 161, Figs. 43-45. 



Vegetative cells 30-35/x x 210-350 m, with plane end walls; 2 to 3(4) 

 chromatophores, making 2.5 to 4 turns; fertile cells inflated to 59/x; 

 conjugation scalariform; tubes formed by both gametangia; zygospores 

 ellipsoid, 4^-46/v. x 8(S-ii8/a; median spore wall yellow-brown, scrobic- 

 ulate. (PI. XXVIII, Figs. 19-20.) 



United States: Texas and Florida. 



Slam, Koh Chang. 



The conjugating tubes frequently appear to have been formed by the 

 male gametangium, due to the growth of the wall of the receptive gam- 

 etangium. 



115. Spirocyra miamiana Taft 1944. Ohio Jour. Sci. 44, p. 238. 



Vegetative cells 20-25/'. x 1 50-340 /j., with plane end walls; 3 chro- 

 matophores (rarely 2), making 1.5 to 5 turns; conjugation scalariform; 

 tubes formed by both gametangia; fertile cells enlarged to 41 /a, length 

 71 to 172/1; zygospores ellipsoid to cylindric-ellipsoid, ^o-:5g/'. x 92/x; 

 median spore wall composed of 2 layers; the outer layer wrinkled; the 

 inner layer finely scrobiculate, yellow-brown at maturity. 



United States: Florida, Miami Beach and Winter Park. 



This species is at first attached to various underwater objects in flowing 

 water. 



116. Spirogyra smithii Transeau 1934. Trans. Amer. Micros. Soc. 



53, p. 225. 



Vegetative cells 30-35 /^ x 220-360^1, with plane end walls; 3 to 4 

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

 iform; tubes formed by both gametangia; fertile cells enlarged; zygo- 

 spores ellipsoid, 45-52 /j. x 75-102 /x; median spore wall yellow-brown, of 

 2 layers — outer, thin, wrinkled; inner, reticulate. (PI. XXVIII, Figs. 

 17-18.) 



United States: Arkansas to Texas, east to New York and Florida. 



Named for Professor Ben H. Smith, Indiana State Teachers College at 

 Terrc Haute, who collected the type specimens, and added many new 

 records to the Indiana algal flora. 



117. Spirogyra chungkingensis Jao 1935. Sinensia. 6, p. 600, PI. 8, 



Figs. 85-86. Amer. Jour. Bot. 23, p. 58. 1936. 



Vegetative cells 22-26/J. x 80-170/A, with plane end walls; 3 chro- 

 matophores, making i to 3 turns in the cell; conjugation scalariform; 

 tubes formed by both gametangia; fertile cells inflated; zygospores 

 ellipsoid, 35-39/^ X 54-68 m; median wall of 2 layers, of which the outer 



