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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 shortened
and more or less reflexed gametangia; receptive gametangia in-
flated to 72iM; spores ellipsoid, sometimes more or less ovoid, ju. 41-67 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, sometimes
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-