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i8o ZYGNEMATACEAE<br />
114. Spirogyra schmidtii W. & G. S. West 1902. Bot. Tidsskrift.<br />
24, p. 161, Figs. 43-45.<br />
Vegetative cells 30-35/x x 210-350 m, with plane end walls; 2 to 3(4)<br />
chromatophores, making 2.5 to 4 turns; fertile cells inflated to 59/x;<br />
conjugation scalariform; tubes formed by both gametangia; zygospores<br />
ellipsoid, 4^-46/v. x 8(S-ii8/a; median spore wall yellow-brown, scrobic-<br />
ulate. (PI. XXVIII, Figs. 19-20.)<br />
United States: Texas and Florida.<br />
Slam, Koh Chang.<br />
The conjugating tubes frequently appear to have been formed by the<br />
male gametangium, due to the growth of the wall of the receptive gametangium.<br />
115. Spirocyra miamiana Taft 1944. Ohio Jour. Sci. 44, p. 238.<br />
Vegetative cells 20-25/'. x 1 50-340 /j., with plane end walls; 3 chromatophores<br />
(rarely 2), making 1.5 to 5 turns; conjugation scalariform;<br />
tubes formed by both gametangia; fertile cells enlarged to /a, 41 length<br />
71 to 172/1; zygospores ellipsoid to cylindric-ellipsoid, ^o-:5g/'. x 92/x;<br />
median spore wall composed of 2 layers; the outer layer wrinkled; the<br />
inner layer finely scrobiculate, yellow-brown at maturity.<br />
water.<br />
United States: Florida, Miami Beach and Winter Park.<br />
This species is at first attached to various underwater objects in flowing<br />
116. Spirogyra smithii Transeau 1934. Trans. Amer. Micros. Soc.<br />
53, p. 225.<br />
Vegetative cells 30-35 /^ x 220-360^1, with plane end walls; 3 to 4<br />
chromatophores, making i to 3 turns in the cell; conjugation scalar-<br />
iform; tubes formed by both gametangia; fertile cells enlarged; zygo-<br />
spores ellipsoid, 45-52 /j. x 75-102 /x; median spore wall yellow-brown, of<br />
2 layers—outer, thin, wrinkled; inner, reticulate. (PI. XXVIII, Figs.<br />
17-18.)<br />
United States: Arkansas to Texas, east to New York and Florida.<br />
Named for Professor Ben H. Smith, Indiana State Teachers College at<br />
Terrc Haute, who collected the type specimens, and added many new<br />
records to the Indiana algal flora.<br />
117. Spirogyra chungkingensis Jao 1935. Sinensia. 6, p. 600, PI. 8,<br />
Figs. 85-86. Amer. Jour. Bot. 23, p. 58. 1936.<br />
Vegetative cells 22-26/J. x 80-170/A, with plane end walls; 3 chro-<br />
matophores, making i to 3 turns in the cell; conjugation scalariform;<br />
tubes formed by both gametangia; fertile cells inflated; zygospores<br />
ellipsoid, 35-39/^ X 54-68 m; median wall of 2 layers, of which the outer