PAPERS GIVING RUSTS OF NORTH AMERICA. 191 



Class V. GYMNOMYCETES (Entophyt.e and Tubercularini 



Fries). 



Series I. Entophyt.^. 



Genus 211. C.eoma. 



a Subgenus Uredo. 



I. Ustilago. 



Note. — The six species under this heading nos. 281 1 to 2816 are 

 smuts belonging to the Ustilaginales, and are therefore omitted. 



2. Riibigincs (Orange-yellows). 



2817. 7. C. U. Rubigo, Lk. n. 9. Halsey from New York, on cereals. 



Represented by part of a leaf, 6 cm. long, mounted, and a similar 

 piece of leaf, nearly as long, in the original packet, each about i cm. 

 broad. The packet is labelled " Uredo tccta Halsey," and again 

 later " Cjeoma rubigo Newyork Halsey." 



Both leaves appear to be those of wheat (Trittcum zndgare Vill.), 

 and are well covered with large, scattered, oblong uredinial sori. 



The name was correctly applied by Schweinitz in the sense in 

 which it was first employed by De Candolle and others of the times. 

 It covers a number of species, however, and the one represented by 

 the collection is Puccinia graminis Pers., in its uredinial stage, now 

 usually called P. poculiforinis (Jacq.) Wettst. 



2818. 8. C. U. linearis, Lk. n. 8, Syn. Car. 464, on leaves of cereals, Salem, 



Bethlehem, and everywhere. 

 (464. 6.. [Uredo] linearis. Fairly common on grain.) 



Represented by portions of four narrowly linear leaves, each 

 piece 8 to 10 cm. long, loose in a mounted packet, bearing a few 

 scattered uredinial sori. The original packet is labelled inside 

 "Uredo linearis Sal," and outside " Cseoma (Ured) lineare Salem." 



The compound microscope easily shows the rust to be the 

 uredinial stage of Puccinia Poartmi Niessl now more often referred 

 to P. epiphylla (L.) Wettst. It is characterized by peculiar capi- 



