AMERICAN UREDINE^E. . OI 



II. Sori amphigenous, round or oblong, tardily naked, 

 ruptured epidermis prominent, brown; uredospores globose to 

 elliptical, brown, 26-32 by 22-28^; wall rather thin, echinulate, 

 colored; pores 4, placed irregularly, but inclined to be equa- 

 torial. 



III. Sori amphigenous, round or oblong, tardily naked, 

 ruptured epidermis prominent, 1-2 mm. long, brownish black; 

 teleutospores oblong or elliptical, sometimes obovate, golden 

 brown, 30-37 by 17-26//, somewhat constricted at middle, 

 smooth; apex obtuse or rounded, moderately thickened; base 

 rounded, less frequently somewhat narrowed; pedicel tinted, 

 not very firm, usually equalling the spore, but sometimes twice 

 as long. 



A common species, but not so abundant as the extensive 

 cultivation of the host plant would lead one to expect. The 

 uredospores upon drying become depressed at the pores, and 

 take on a sub-angular outline. 



EXSIC. 

 Ellis, N. A. F. 268. 

 Ravenel. F. Car. Ex. 92. 

 Seymour and Earle. Econ. Fungi 72. 

 Svdow. lied., 921. 

 Linhart, Fungi hung. 27. 

 Thuemen, Myc. univ. 231, 321& 

 Rabenhorst, Fungi europasi 2172. 

 Ellis and Everhart Fungi Columb. 257. 



33. Puccinia atra Diet. & Holzu. ( 1897. Bot. Gaz. 24:29.) 



33^. On Sctaria grisebachii Fourn. Rio Hondo near City of Mexico. 



Mex., /A-/;. ar. 



Orig. Desc. " Sori mostly hypophyllous; uredosori mostly linear, up to 

 5 nun. long, naked, pulverulent, cinnamon-brown; spores elliptical or 

 ovate, 27-35 by 21-25//, closely covered with small warts, brown: 

 teleutosori punctiform or linear, scattered or clustered, naked, black; 

 spores elliptical, rounded at both ends, scarcely constricted, smooth 

 chestnut-brown, apex with hooded thickening (about 5 fi), 31-38 by 

 21 26/i; pedicel rather firm, up to 85// long, hyaline, often brownish 

 next the -pore." 



The uredospores of this species are thin-walled, minutely 

 and evenly papillose, and have four germ pores, equatoriallv 



