441 



The combination D. Seymeriae (Burr.) Arthur was made in 

 Result. Sei. Congr. Bot. Vienne 347. 1906. By a typographical 

 error the specific name was written "Seymouriae." Puccinia 

 Seymeriae Burr, not Puccinia Seymourii Lindl. was clearly in- 

 tended. The latter is probably not a Dasyspora and in any case 

 •is a synonym of P. musenii E. & E. 



39. DASYSPORA SILPHII (Schiv.) Arih. 



Puccinia Silphii Schw. 

 Dicaeoma Silphii (Schw.) Kuntze. 

 On Silphium integrifolium Michx. 1903:151. 



Tippecanoe, 1901 (Dorner). 

 On Silphium perfoliatum L. 



Tippecanoe, 1906 (Wilson, Olive, Kern). 

 On Silphium sp. 1893:55. 

 Putnam, 1891 (Underwood). 



40. DASYSPORA XANTHII (Schw.) Arih. 



Puccinia Xanthii Schw. 

 Dicaeoma Xanthii (Schw.) Kuntze. 

 On Ambrosia trifida L. 1896:222. 1905:182. 



Gibson, 1915 (Hoffer) ; Hamilton, 1905 (Wilson); Tippecanoe, 

 1896 (Snyder). 

 On Xanthium americanum Walt. 1893:56. 



Johnson, 1890 (Underwood) ; Montgomery, 1893 (Olive) ; Orange, 



1913 (Arthur & Ludwig); Putnam, 1891 (Underwood); Tippe- 

 canoe, 1905 (Wilson). 



On Xanthium communis Britton. 



Allen, 1911 (Orton); Montgomery, 1910 (Jennison); Tippecanoe, 



1914 (Travelbee). 



On Xanthium pennsylvanica Wallr. 1893:56. 1896:222. 1905:182. 

 Fountain, 1914 (Arthur); Hamilton, 1905 (Wilson); Marion, 

 1905 (Wilson); Montgomery, 1890 (Fisher); Putnam, 1893 

 (Underwood); Tippecanoe, 1896 (Snyder). 

 On Xanthium spinosum L. 

 Tippecanoe, 1895 (Arthur). 



The earlier collections recorded in the Proceedings were mainly 



