441 
The combination D. Seymeriae (Burr.) Arthur was made in 
Result. Sci. 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 EK. & E. 
39. DASYSPORA SILPHII (Schw.) Arth. 
Puccinia Silphii Sehw. 
Dicaecoma 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.) Arth. 
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 
