VOLUME XXXIV 



NUMBER I 



Botanical Gazette 



JULY, I go 2 



THE UREDINEyE OCCURRING UPON PHRAGMITES, 

 SPARTINA, AND ARUNDINARTA IN AMERICA.' 



J, C. Arthur. 



(with four figures) 



Upon the several species of Phragmites, Spartina, and Arun 

 dinaria there occur in America one species of Uromvces and six 

 species of Puccinia. There has never existed material confusion 

 regarding the Uromyces species, except to divide it into i^NO upon 

 geographical grounds ; but the Puccinia species have been so 

 much confused and misunderstood that one may say with much 

 truth that, whenever a correct determination has been made, it has 

 been due more to good fortune than to clear insight. The most 

 common disposition of these six species has been to list them 

 indiscriminately under P. Phragmitis (Schum.) Korn., or possibly 

 under P. armtdinacea Hedw, or DC, or occasionally under P. 

 Aru7idinari(B Schv^ . In 1876 Kornicke* showed that in Europe 

 two species of Puccinia occur upon Phragmites that are mor- 

 phologically distinguishable, which he diagnosed under the 

 names P, Phragmiiis and P, MagJiusiana. The first of th 

 species appears to be cosmopolitan and occurs in America, but 

 not the second one. This second species is represented by a 

 closely related one, however, which, together with the other 



four species of Puccinia and on^ of Uromyces described in this 



'Presented by title at the Columbus meeting of the Botanical Society of 

 America, Ag 1899. 



'Hedwigia 15: 178. 1S76. 



