312 NATURAL HISTORY BULLETIN. 



The nomenclature of the hosts is that used in the first 

 edition of Britton's Manual, so far as there represented. 



The first article of this series contained descriptions of 

 species numbered from one to seventeen, the second article 

 contained numbers eighteen to thirty-four, the third thirty- 

 five to forty-four, and the present article contains numbers 

 forty-five to sixty. 



45. Uromyces aristida E. & E. (1887. Jour. Myc. 



3:56.) 



45a. On Aristida basiramea Engelm., Ill, Long Pine, Neb., Bates. 

 456. On Aristida oligantha Michx., Ill, Denton, Texas, Long. 



OriG. Descr. "III. Sori linear, 1-2 millim. long, naked (when mature), 

 dark ferruginous-brown; spores loosely compacted in the sori, elliptical 

 or obovate, 25-35 X 18-22//, smooth, yellowish-brown, on long (80- 

 100/i), stout but deciduous pedicels, epispore not distinctly thickened 

 above. 



II. Uredospores nearly globose, 24-27^ in diameter, wall 

 rather thin, golden yellow, minutely verrucose. 



III. Teleutosori epiphyllous, oblong to linear, intercostal, 

 early naked, dark ferruginous brown; teleutospores broadly 

 oblong or obovate, to nearly globose, 18-26 by 28-38/*, side 

 walls rather thick, apex considerably thickened, pedicel stout, 

 tinted, once to twice and a half the length of the spore. 



EXSIC: 

 Carleton, Ured. Amer., 26. 

 Shear, Ell. & Ev., Fungi Columb. Cont., 1469. 



We have not been so fortunate as to secure satisfactory 

 uredosporic material for distribution or study. The emended 

 description for the second stage was drawn from the few 

 spores associated with the teleutospores, and is necessarily 

 imperfect. 



The original description of the teleutospores does not 

 accord exactly with the appearance of the spores in the 

 several collections we have examined (we have not seen the 

 type), more particularly regarding the thickness of the apex, 



