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202 ZYGNEMATACEAE<br />
Vegetative cells about 45 /j- x 45-135 m, with plane end walls; 5 chro-<br />
matophores, making .5 to 1.5 turns; conjugation scalariform; tubes<br />
formed by the male gamctangia; fertile cells inflated; zygospores ovoid,<br />
about 55 M X S2/i; median spore wall brown, smooth.<br />
France, Montpellier.<br />
196. Spirogyra visenda Transeau 1944. Ohio Jour. Sci. 44, p, 243.<br />
Vegetative cells 40-45 /x x 130-300^1, with plane end walls; i narrow<br />
chromatophore, making 4 to 9 turns in the cell; conjugation scalariform,<br />
with broad tubes formed wholly by the male gametangia; receptive<br />
gametangia inflated to 60-80 m; zygospores ellipsoid, sometimes ovoid,<br />
35-65 ju X 92-124 fi; median spore wall yellow, smooth. (PI. XXXIV,<br />
Fig- 15-)<br />
United States: Mississippi, Columbus, April 14, 1935.<br />
Both gametangia are reflexed, and the conjugating pairs are separated<br />
by much longer vegetative cells.<br />
197. Spirogyra hungarica Langer 1932. Folia Crypt. 1, p. 1070,<br />
Figs. 1-8.<br />
Vegetative cells 53-56 ju. x 1 50-400 m, with plane end walls; i chro-<br />
matophore, making 6 to 10 turns in the cell; conjugation scalariform;<br />
tubes obconical, formed wholly by the male gametangia; receptive gam-<br />
etangia slightly inflated on the conjugating side; zygospores ellipsoid,<br />
/x 45-53 X 1 20-1 48 /i^; median spore wall smooth, yellow-brown. (PI.<br />
XXXIV, Fig. 12.)<br />
Hungary, Sopron.<br />
SPECIES WITH SEMIREPLICATE END WALLS<br />
198. Spirogyra narcissiana Transeau 1914. Amer. Jour. Bot. 1,<br />
p. 290, PI. 25, Figs. 4-6.<br />
Vegetative cells 12-14/x x 200-400)11, with semireplicate end walls;<br />
I chromatophore, making 2 to 5 turns; zygospores unknown; sporif-<br />
erous cells inflated toward the middle up to 25-53^; aplanospores eUip-<br />
soid to ovoid, 23-501". x 50-120JU; median spore wall yellow, smooth.<br />
(PI. XXXV, Figs. 1-3.)<br />
United States: Illinois, Charleston (above dam in small stream north<br />
of golf links), September, 1912.<br />
The end walls of the cells of this and the next species are unique and<br />
under the microscope look like an end view oi a partly open transom. It<br />
was found in this same stream in September in 2 subsequent years but was<br />
not found in any other nearby streams, although many collections were<br />
made and analyzed.