168 Iflinois State Laljoratonj of NuturaJ Histonj. 



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 ;it; pedicels fragile, deciduous. 



On \ea.\es, oi Allium striatum: Union, April 12, 4028, I,, 

 III., April 15, 4108, I.. TIL, April 17. 4189. T.. III.; Jackson, 

 April 28, 4865. 



The only perceptible difference between the Illinois speci- 

 mens and those on Enjtlironium from Europe is in the small 

 number of ajcidia 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- 

 forni, echinulate, 12-18 by 18-21 ^. occasionally longer. Teleu- 

 tospores chivate 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 21-82 ^u. 



On JuucHS tenuis: Pulaski. May 1, 4404, II.: Stepheuson, 

 Sept. 13. 5880. II.. III. 



The teleutosori are often uinch infested with D<irJur<( 

 filum, a parasite on a })arasite. On Juurus tenuis this seems 

 especially true. 



U. scirpi, Biirrill. 



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 27-86 fi. III. Spores clavate- 

 elliptical, widest at centre, mostly pointed, brown, apex dai'ker, 

 and thickened, 18 by 32-42 ,a; pedicel stout. su])hyHline, about 

 the length of the spore. 



