202 ZYGNEMATACEAE 



Vegetative cells about 45 /j- x 45-135 m, with plane end walls; 5 chro- 

 matophores, making .5 to 1.5 turns; conjugation scalariform; tubes 

 formed by the male gamctangia; fertile cells inflated; zygospores ovoid, 

 about 55 M X S2/i; median spore wall brown, smooth. 



France, Montpellier. 



196. Spirogyra visenda Transeau 1944. Ohio Jour. Sci. 44, p, 243. 

 Vegetative cells 40-45 /x x 130-300^1, with plane end walls; i narrow 



chromatophore, making 4 to 9 turns in the cell; conjugation scalariform, 

 with broad tubes formed wholly by the male gametangia; receptive 

 gametangia inflated to 60-80 m; zygospores ellipsoid, sometimes ovoid, 

 35-65 ju X 92-124 fi; median spore wall yellow, smooth. (PI. XXXIV, 



Fig- 15-) 



United States: Mississippi, Columbus, April 14, 1935. 



Both gametangia are reflexed, and the conjugating pairs are separated 

 by much longer vegetative cells. 



197. Spirogyra hungarica Langer 1932. Folia Crypt. 1, p. 1070, 



Figs. 1-8. 



Vegetative cells 53-56 ju. x 1 50-400 m, with plane end walls; i chro- 

 matophore, making 6 to 10 turns in the cell; conjugation scalariform; 

 tubes obconical, formed wholly by the male gametangia; receptive gam- 

 etangia slightly inflated on the conjugating side; zygospores ellipsoid, 

 45-53 /x X 1 20-1 48 /i^; median spore wall smooth, yellow-brown. (PI. 

 XXXIV, Fig. 12.) 



Hungary, Sopron. 



SPECIES WITH SEMIREPLICATE END WALLS 



198. Spirogyra narcissiana Transeau 1914. Amer. Jour. Bot. 1, 

 p. 290, PI. 25, Figs. 4-6. 



Vegetative cells 12-14/x x 200-400)11, with semireplicate end walls; 

 I chromatophore, making 2 to 5 turns; zygospores unknown; sporif- 

 erous cells inflated toward the middle up to 25-53^; aplanospores eUip- 

 soid to ovoid, 23-501". x 50-120JU; median spore wall yellow, smooth. 

 (PI. XXXV, Figs. 1-3.) 



United States: Illinois, Charleston (above dam in small stream north 

 of golf links), September, 1912. 



The end walls of the cells of this and the next species are unique and 

 under the microscope look like an end view oi a partly open transom. It 

 was found in this same stream in September in 2 subsequent years but was 

 not found in any other nearby streams, although many collections were 

 made and analyzed. 



