i66 ZYGNEMATACEAE 



34-38^1 X 58-68 /x; median spore wall yellow to yellow-brown; scrobic- 

 ulate. (PI. XXIV, Fig. 17; PI. XXV, Figs. &-y.) 



United States: Utah; Wisconsin; Illinois; Kentucky; Michigan; Ohio; 

 Mississippi. 

 Austria. 

 Differs from S. varians in the scrobiculate median spore wall. 



58. Spirogyra aphanosculpta Skuja 1937. Hedwigia. 77, p. 55. 

 Vegetative cells 32-38/a x 50-119/1, with plane end walls; i chro- 



matophore, making i to 4 turns; conjugation scalariform; tubes formed 

 by both gameiangia; female gametangia 43-150/1 in length, cylindric 

 or inflated on the conjugating side; sterile cells sometimes inflated; 

 zygospores ellipsoid to cylindric-ellipsoid, 31-40/1 x 43-81 /t; median 

 spore wall yellow-brown, punctate with angular and irregular pits. 

 (PI. XXV, Fig. 8.) 



United States: New Hampshire, Hanover (Blum Coll.). 



Greece, Taygetus; Africa, Cape Colony (Stephens Coll.). 



59. Spirogyra kaffirita Transeau 1934. Tm?2s. Amer. Micros. 



Soc. 53, p. 228, Fig. 59. 



Vegetative cells 39-45/1 x 65-140/1, with plane end walls; i chro- 

 matophore; conjugation scalariform; tubes formed by both gametangia; 

 fertile cells inflated on the inner side; zygospores ellipsoid, 32-40,1 x 

 45-6o(-75) p-'y median spore wall yellow, shallow-granulate, reticulate. 

 (PI. XXV, Fig. II.) 



Africa, Cape Colony (Stephens Coll.). 



60. Spirogyra tuberculata Lagerheim 1896. Wittrock and Nord- 



stedt Algae Exsiccatae, No. 1379. 



Vegetative cells 35-37 /^ x 70-165/1, with plane end walls; i chro- 

 matophore; conjugation scalariform; tubes formed by both gametangia; 

 fertile cells inflated on both sides; zygospores ellipsoid with rounded 

 ends, 30-38/1 x 50-67 /j.; median spore wall yellow, irregularly verrucose. 



Sweden, Uppsala. 



The inflation of the fertile cells and the smaller dimensions distinguish 

 this species from S. australensis. 



61. Spirogyra daedalea Lagerheim 1888. Nuova Notarisia, p. 592. 

 Vegetative cells 33-36/1 x 180-330/1, with plane end walls; i chro- 



matophore, making 2 to 3.5 turns; conjugation scalariform; tubes 

 formed by both gametangia; fertile cells cylindric or enlarged to 36-45/1, 

 and shortened; zygospores ellipsoid, 30-40/1 x 50-96/1; median spore 

 wall yellow-brown, very irregularly corrugate. (PI. XXV, Figs. 9-10.) 

 United States: Iowa. 



