SPIROGYRA 201 



matophore, making 3 to 7 turns; conjugation scalar if orm; conjugating 

 tubes formed almost wholly by the male gametangia; fertile cells in 

 groups of 2 or 4, rarely continuous, inflated on the inner side to 50 /x; 

 zygospores ellipsoid, 37-42 i^t x 57-100 /a; median spore wall yellow, 

 minutely punctate. (PI. XXXIV, Fig. 9.) 



United States: Wisconsin (Prescott Coll.); Illinois; Arkansas (Couch 

 Coll.). 



192. Spirogyra corrugata Transeau 1934. Trans. Amer. Micros. 



Soc. 53, p. 229. 



Vegetative cells (30-) 32-36 (-40)^1 x 1 40-280 ( -400 ) /x, with plane 

 end walls; i to 3 chromatophores, making 2 to 4 turns; conjugation 

 scalariform; tubes formed by the male gametangia, usually long and 

 broad; fertile cells solitary or in pairs (rarely in series) between vege- 

 tative cells, shortened and inflated to 40-60 /a; zygospores ovoid, 42-60 /a 

 X 8o-i20jtt; median spore wall of 2 layers, outer thin, coarsely and irreg- 

 ularly corrugate; inner yellow or brownish-yellow, finely reticulate. 

 (PI. XXXIV, Figs. lo-ii.) 



United States: Illinois; Mississippi; Alabama (Thut Coll.); Tennessee 

 (Bold Coll.); Oklahoma (Taft Coll.); West Virginia (Hamblin Coll.). 



China, Szechwan (Jao Coll.). 



193. Spirogyra rugulosa Ivanof 1902. From Bot. Zentralbl. 93, 



p. 383. 1903. Teodoresco. Bot. Zent. Beth. 21, p. 192, 

 Figs. 81-87. 1907. 

 Vegetative cells 47-57 /^ x 100-350 /j., with plane end walls; i chro- 

 matophore, making 3 to 11 turns; conjugation scalariform; tubes formed 

 by male gametangia; fertile cells shortened, inflated on the conjugating 

 side; zygospores ellipsoid or ovoid, 45-52 /x x 102-127;",; median spore 

 wall yellow-brown, finely punctate. (PI. XXXIV, Fig. 14.) 

 United States: Illinois, Charleston, in an old prairie pond. 

 Russia, Bologoe; Rumania, Chita. 



194. Spirogyra wabashensis Tiffany 1927. BoL Gaz. 83, p. 202, 



PI. 9, Fig. I. 



Vegetative cells 40-50 /^ x 120-400 ju^, with plane end walls; 2 to 4 

 chromatophores, making .5 to 4.5 turns; conjugation scalariform; tubes 

 formed by the male gametangia; fertile cells inflated, single or in groups 

 of 2, alternating with vegetative cells; zygospores ellipsoid, 56-76 /x x 

 110-150/A; median spore wall yellow, areolate. (PI. XXXIV, Fig. 13.) 



United States: Illinois, Brownsville. 



195. Spirogyra conspicua Gay 1884. Essai d'une monographie 



locale des Conjuguees, p. 91, PI. 4, Fig. 5. 



