SIROGONIUM 



233 



Fig. G. — Conjugation through end wall of male gametangial filament in Sirogonium 

 sticticum. Specimen and drawing from C. E. Taft. 



2. Sirogonium sticticum (Engl. Bet.) Kiitzing 1843. Phyco- 



logia Getieralis, p. 278. 



Vegetative cells 38-56/4 x 80-300 /x; chromatophores 3-6, nearly 

 straight, or making .5 turn; conjugation direct between usually short- 

 ened and more or less reflexed gametangia; receptive gametangia in- 

 flated to 72iM; spores ellipsoid, sometimes more or less ovoid, 41-67 ju. x 

 68-127/4; median spore wall smooth, yellow. (PI. XL, Figs. 1-4.) 



Widely distributed in Europe, Asia, Africa, South America, Australia, 

 and in the United States, and southern Canada. The numbers of chroma- 

 tophores, cell diameters, and spore dimensions are highly variable. 



3. Sirogonium megasporum (Jao) Transeau 1944. Ohio Jour. 



Sci. 44, p. 244. Sinensia. 6, p. 645, PI. 12 (as S. sticticum 

 var. megasporum). 1935. 



Vegetative cells 48-55 /(■ x 90-385 /x; chromatophores 3 to 4, some- 

 times 2, straight, or making .5 turn in the cell; conjugation direct, gam- 

 etangia shortened, reflexed, and more or less inflated on the inner side; 

 receptive gametangia inflated up to 100 /x; zygospores ellipsoid to ovoid, 

 70-85/1. X 100-122 /I ; median spore wall smooth, yellowish-brown at 

 maturity. (PL XL, Fig. 5.) 



United States: Texas, Bastrop, April 17, 1938 (Taft Coll.). 



China, Szechwan; South America, Ecuador, near Quito (Prescott Coll.). 



4. Sirogonium floridanum (Transeau) G. M. Smith 1933. 



Freshwater Algae of the United States, p. 557. Transeau. 

 Ohio Jour. Sci. 16, p. 30. 1915. 



Vegetative cells 56-66/1. x 120-335/1; 4-5 chromatophores, nearly 

 straight, or making a half turn; conjugation direct; gametangia short- 



