2o8 ZYGNEMATACEAE 



chromatophore, making 3 to 8 turns in the cell; reproduction by zygo- 

 spores and aplanospores; conjugation lateral and scalariform; tubes 

 formed by both gametangia; receptive gametangia more or less cylin- 

 drically inflated up to 51 ju toward the middle; zygospores ellipsoid to 

 cylindric-ellipsoid, 34-48/1 x ioo-130/x; median wall smooth, chestnut 

 brown; aplanospores similar, 34-44 ]"• x 60-90 /a. (PI. XXXVI, Figs. 

 10-13.) 



United States: Several localities near Boston, Massachusetts (Bollard 

 Coll.); Illinois, Coles County near Lerna. 



Original collection from Disko, Greenland, August 7, 1871, by T. M. 

 Fries. Identity of American material verified by Rosenvinge. Cell walls of 

 this species are unusually light-refractive and appear brighter and better 

 defined than those of other species of the genus — probably due to a larger 

 proportion of cellulose in the walls. 



219. Spirocyra quadrata (Hassall) Petit 1874. Bull. soc. hot. de 



France. 21, p. 41, PI. i, Fig. 2. 



Vegetative cells 24-30 /a x 70-^500 /j., with replicate end walls; 1 chro- 

 matophore, making 1.5 to 6 turns in the cell; reproduction by zygo- 

 spores and aplanospores; conjugation scalariform and lateral; tubes 

 formed by both gametangia; receptive gametangia cylindrically inflated 

 toward the middle up to 60 m; zygospores ellipsoid to cylindric-ellipsoid, 

 33-44/1 X 50-82 /t; median wall smooth, brown; aplanospores similar 

 but smaller. (PI. XXXVI, Figs. 14-16.) 



United States: All states from Iowa to Massachusetts. 



Widely distributed in Europe, and in northern and southern China. 



The form with 2 chromatophores in most cells (var. bijasciata Kirchncr 

 1878) has been found in Illinois, also in Clark County, Kentucky (Mclnteer 

 Coll.). 



220. Spirogyra fritschiana Czurda 1932. Siisswasserflora Mittel- 



europa. 9, p. 156. Trans. Roy. Soc. S. Africa. 18, p. 50, 

 Fig. 14A-B (as S. protecta var. inflata). 

 Vegetative cells 17-24/1 x 80-260 /t, with replicate end walls; i chro- 

 matophore; conjugation lateral and scalariform; tubes formed by both 

 gametangia; fertile cells inflated toward the middle; zygospores eUip- 

 soid, 35-40/1 X 55-64 /x; median spore wall brown, coarsely punctate. 

 (PI. XXXVI, Figs. 19-20.) 

 South Africa, Kimberley. 



221. Spirogyra goetzei Schmidle 1902. Engler's Bat. Jahrb. 30, 



p. 251, PI. 4, Fig. 8. 

 Vegetative cells 22-25/1 x 160-^20/1, with replicate end walls; i 

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



