168 Illinois State Laboratory of Natural History. 



none; sori amphigenous, few. scattered, elliptical, usually re- 

 maining partly covered by the epidermis; teleutospores sub- 

 globose to oblong, apiculate. marked with longitudinal striae. 

 15-21 by 20-30 /*: pedicels fragile, deciduous. 



On leaves of Allium striatum : Union, April 12, 4028, I., 

 TIL, April 15, 4108, L, III., April 17, 4139, I., III.; Jackson, 

 April 28, 4365. 



The only perceptible difference between the Illinois speci- 

 mens and those on Erythronium from Europe is in the small 

 number of aecidia in a cluster. 



U.junci, (Schw.) Tul. 



II., III. Sori amphigenous, scattered or sometimes con- 

 fluent, roundish or elongated, prominent, long covered by the 

 epidermis, and after the rupture of the latter its edges 'conspic- 

 uous, the uredosori yellowish brown, the teleuto sori dark 

 brown. Uredospores subglobose, elliptical or sometimes pyri- 

 form, echinulate, 12-18 by 18-21 /*, occasionally longer. Teleu- 

 tospores clavate or irregularly elliptical, usually widest towards 

 the top, smooth; apex obtuse, rounded or truncate, strongly 

 thickened, deep brown; base narrowed; pedicel somewhat col- 

 ored, nearly or quite as long as the spore; 14-18 by 21-32 ^. 



On Juncus tennis: Pulaski. May 1. 4404, II.; Stephenson, 

 Sept. 13, 5830, II.. III. 



The teleutosori are often much infested with D(irluc<i 

 Jilum. a parasite on a parasite. On Juncns tennis this seems 

 especially true. 



U. scirpi, Burrill. 



II., III. Amphigenous, spots brown, indeterminate; sori 

 long covered by the epidermis, minute and rounded, or larger, 

 oblong, sometimes confluent end to end ; forming clusters up 

 to one fourth of an inch long, nearly black. Spores among 

 the teleutospores few, irregularly elliptical, yellowish brown, 

 sparsely echinulate, 15-20 by 27-36 /*. III. Spores clavate- 

 elliptical, widest at centre, mostly pointed, brown, apex darker, 

 and thickened, 18 by 32-42 ^ ; pedicel stout, subhyaline, about 

 the length of the spore. 



