AMERICAN UREDIXE.E. -S7 



25^7. On Sporobcius keterolepis Gr., Decorah, Iowa, Holwqy. 

 Orig. Desc. "II. Uredospores yellow, round, minutely roughened, 24 to 

 2S mmm. in diameter. 



III. Sori on the leaves and stem, oblong or linear, brownish black, 

 early naked: encircling epidermis not very conspicuous; teleutospores 

 oblong to oblong-clavate, smooth, somewhat or not at all constricted 

 in the middle, deep brown at least above. 15 to 21 mmm. broad by 2S 

 to 45 mmm. long : apex thickened, semi-circular to obtuse: base acutish 

 or less often obtuse; pedicel rather stout, as long or shorter than the 

 spore, colored. 



On Sporobolus heterolepis Gr. Ames, Spirit Lake, Decorah.'* 



II. Uredospores yellow, round, echinulate. 24-30 « in 

 diameter, pores 5 or more, not equatorial. 



III. Sori oblong or linear, amphigenous. brownish black, 

 early naked, ruptured epidermis scarcely evident: teleuto- 

 spores oblong to oblong-clavate, somewhat or not constricted 

 in the middle. 2S-45 X 17-22 u . apex semi-circular to obtuse, 

 thickened sometimes as much as 8 «, base narrowed, epispore 

 rather deep yellowish brown, smooth. Pedicel colored, about 

 as long as the spore. 



The type material of this seeminglv rare species, which is 

 in the herbarium of the author of the species, has been care- 

 fully re-examined*. The material, from which the characters 

 of the species were drawn, was collected at Decorah. low a. 

 on Sept. 18. 1884. bv E. W. D. Holwav. Three other col- 

 lections, made at Ames and Spirit Lake of the same state. 

 were erroneouslv assigned to the species, and gave rise to the 

 comments, which follow the description, regarding the pres- 

 ence of one-celled teleutospores. The characters as given for 

 the one-celled form in reality belong to Uromyces graminicola, 

 the host being in fact Panicum virgatum and not a Sforobolus. 

 One celled spores in the true P. sporoboli have not yet been 

 observed. So far as the authors know the species has only 

 been collected at Decorah. Iowa, and good uredo material has 

 not yet been seen. 



* It is probable that duplicate type material is in the herbarium of the 

 Iowa Agricultural College, but many of the sheets containing grass forms 

 have been withdrawn and for the time being are inaccessible, and a care- 

 ful examination of the remainder of the uredineous herbarium, kindly 

 loaned by Professor L. H. Pammel, has not revealed it. 



