AMERICAN UREDINE^E. 187 



setaceum, only somewhat irregular in form, while the 

 teleutospores are intermediate between those of Paspalum 

 setaccum and P. paniculatum. The oblique irregular 

 teleutospores of Puccinia paspali, and the linear sori, are 

 the only marked characters with which to separate this 

 species from Puccinia substriata, and these may be a 

 local result of the influence of the host. We are inclined 

 to think either that there is but one polymorphous 

 species, or that the forms here included in Puccinia 

 stibstriata on Pennisetum mexicannm and on Paspalum 

 paniculatum are to be separated, making four species in 

 all. The material at our disposal is inadequate for a 

 definite conclusion, and it may be that cultures will be 

 required for the final decision. 



The markings on the teleutospores mentioned in the 

 original description have not been detected by us. The 

 upper cell is said to be "very slightly roughened" and the 

 apex "very faintly striate." These characters do not 

 appear in our material, either when viewed dry or wet. 



43. Uromyces halstedii De Toni. (1888. Saccardo, 

 Syll. Fung. 7:557). 



43a. On Homalocenchrus virginicus II, III, (Willd.) Britton. Dalles 

 of the Wisconsin river, Wis., Arthur. 



Orig. Desc. "Sori mostly hypogenous, small, elongated, forming 

 irregular rows; uredospores 22-25 by 26-30//, elliptical, light yellow, 

 indistinctly echinulate, tips dark; teleutosori shining black, spores 

 wedge-shaped and quite irregular, 17-30 by 25-33//, pedicel about 

 one half the length of the spore. The broad free end of the spore 

 is divided into 5-20 sharp or blunt projections, the longer with 

 hyaline tips." Halsted, 1. c. 



SYN: 

 1887. Uromyces digitatus Halst. Jour. Myc. 3:138. 

 1889. Uromyces halstedii Ludw. Bot. Centrbl. 37: 120. 

 1898. Ctzomurus halstedii Kuntze. Rev. Gen. PI. 3.450. 



Exsic : 



Ellis & Everhart, N. Am. Fungi, No. 2227. 

 V— 2 8 



