1 68 ZYGNEMATACEAE 



aplanospores broadly ellipsoid, 28-36/i. x 43-6o(-72) /x; median wall 

 smooth, vellow-brovvn ; sporangia enlarged or slightly inflated. (PI. 

 XXVI, Figs. 1-2.) 



Brazil, Belem, July 9, 1935 (Drouet Coll.). 



This species resembles Number 29, S. mirabilis (Hassall) Kutzing but 

 differs in having 2 or 3 chromatophores. 



66. Spirogyra irregularis Nageli 1849. In Kiitzing, Species Al- 



garum, p. 440; also 1855, Tab. Phycoth., 5, PI. 23, Fig. 2. 



Vegetative cells 32-37 y^ x 65-250 /x, with plane end walls; 2 to 4 

 chromatophores, making .5 to i turn; conjugation scalariform; tubes 

 formed by both gametangia; fertile cells cylindric; zygospores ellipsoid 

 to cylindric-ellipsoid, 30-36 ju. x 45-90^11; median spore wall yellowish- 

 brown, smooth. (PI. XXVI, Fig. 3.) 



United States: Illinois; Missouri (Drouet Coll.). 



Widely reported from western and central Europe. 



67. Spirogyra fuellebornei Schmidle 1902. Englcr's Bot. ]ahrb. 



32, p. 76, PI. 3, Fig. 2. 



Vegetative cells 40-42 /x x 120-240 m, with plane end walls; 3 chro- 

 matophores, making i to 2 turns; conjugation scalariform and lateral; 

 tubes formed by both gametangia; fertile cells cyhndric; zygospores 

 ellipsoid, more or less pointed, 32-44 /x x 50-80 ju.; median spore wall 

 smooth, yellow-brown. (PI. XXVI, Fig. 4.) 



United States: Wisconsin (Prescott Coll.). 



Africa; Nyassa Lake region; Central America, Panama. 



68. Spirogyra microspora Jao 1935. Sinensia. 6, pp. 593-94, PI. 6, 



Fig. 65. 



Vegetative cells 35-38 /^ x 64-131 m, with plane end walls; 2 chro- 

 matophores, broad with large pyrenoids, making 1.5-3.5 turns in the 

 cell; conjugation lateral; tubes formed by both gametangia; fertile cells 

 cylindric; zygospores ellipsoid, 29-32^ x 51-61 /x; median wall smooth, 

 yellow at maturity. (PI. XXVI, Fig. 5.) 



China, Szechwan, November, 1933. 



69. Spirogyra hollandiae Taft 1947. Ohio Jour. Sci. 47, p. 173. 



Vegetative cells 36-41 /a x 60-192/i., with plane end walls; 2 chro- 

 matophores, broad with large pyrenoids, making 1.5-2.5 turns in the 

 cell; conjugation usually lateral; tubes formed by both gametangia; 

 sterile cells sometimes inflated; receptive gametangia cylindric or en- 

 larged; zygospores ellipsoid with rounded ends, 38-42/1 x 62-78 /x; 

 median wall smooth, bright yellow at maturity. (PI. XXVI, Figs. 6-7.) 



