2i6 ZYGNEMATACEAE 



United States: Illinois, Charleston and Lerna. 

 Austria, Lunz. 



248. Spirogyra insignis (Hassall) Kiitzing 1849. Species Al- 



garum, p. 438. 



Vegetative cells 39-42 m x 150-590/1, with replicate end walls; 2 to 4 

 (usually 3) chromatophores, making .5 to 1.5 turns; conjugation scalar- 

 iform and lateral; tubes formed by both gametangia; fertile cells 

 shortened and inflated; zygospores ellipsoid, 40-48 /^ x 60-128 m; median 

 spore wall yellow-brown, smooth. (PI. XLI, Fig. 17.) 



United States: Iowa; Illinois. 



Widely reported from Europe; China, Nanking and Szechwan. 



249. Spirogyra fallax (Hansgirg) Wille 1900. Nyt Magaz. /. 



Naturw. 38, p. 16. Hansgirg. Hedivigia. 27, p. 253. 

 1888 (as S. insignis var. fallax). 

 Vegetative cells 36-45 ft x 80-165 as with replicate end walls; 3 to 4 

 chromatophores, straight, or making .5 to 1.5 turns in the cell; conjuga- 

 tion scalariform; tubes formed by both cells; fertile cells inflated to 

 48-75 m; zygospores ellipsoid, 45-60/1 x 75-1 20 /x; median spore wall 

 brown, smooth. (PI. XXXVIII, Fig. 13.) 

 United States: Massachusetts. 

 Czechoslovakia. See note under S. inconstans, Number 252. 



250. Spirogyra wangi Li 1933. Ohio Jour. Sci. 33, p. 153, PL i, 



Figs. 7-8. 



Vegetative cells 30-32/^1 x 150-350 as with replicate end walls; 2 to 3 

 chromatophores, making 1.5 to 4.5 turns; conjugation scalariform; tubes 

 formed by both gametangia; fertile cells inflated toward the middle, up 

 to 72 ,u; zygospores ellipsoid, 60-64 /x ^ 112-124/^; median spore wall 

 smooth, yellow. (PI. XXXVIII, Figs. 14-15.) 



China, Hangchow, 1930. 



251. Spirogyra acanthophora (Skuja) Czurda 1932. Siisstvasser- 



fiora Mitteleuropa. 9, p. 160. Skuja. Acta Horti Bot. Univ. 

 Latviensis. 3, p. 114. 1928 (as S. ivillei var. acanthophora). 



Vegetative cells 30-38 /.a x 75-350/1, with replicate end walls; 3 to 4 

 chromatophores, making .5 to 1.5 turns in the cell; conjugation scalar- 

 iform; tubes formed by both gametangia; receptive gametangia inflated 

 to 50-70 /J.; zygospores ellipsoid, 42-60 /x x 80-1 40 /x; median wall irreg- 

 ularly spinose-reticulate, yellow-brcjwn. (Pi. XXXVIIl, Figs. 16-17.) 



Latvia, Kemeri. 



This species differs from the next (No. 252) in the more prominent 

 spines on the reticulum of the median spore wall, and in the decreased 

 reflexing of conjugating gametangia. 



