330 



tatunt which occur on the young twigs may easily be confused with the 

 leaf form unless microscopically examined, and might have been mixed 

 with the material of G. fraternum used in the infection expei'iments. 



28. Phragmidium americanum Diet. Hedwigia 44:124. 1905. 



On Rosaceae: 



Rosa Carolina L. Collins Beach, Oct. 1, 1907. 

 Rosa humilis Marsh., Seaford, June 4, 1908 (2050) ; Lewes, 

 Aug. 14, 1907 (1685). 



29. Phragmidium disciflorum (Tode) J. F. James, Cont. U. S. Nat. 



Herb. 3:276. 1895. 

 Ascophora disci flora Tode, Fungi Meckl. 1:16. 1790. 

 On Rosaceae: 



Rosa sp. (cultivated), Newark, September 1888, F. D. Chester. 



30. Phragmidium Duchesneae (Arth.) Sydow, Monog. Ured. 3:9.3. 



1912. 

 Kuehneola Duchesneae Arthur, N. A. Flora 7:185. 1912. 

 Frommea Duchesneae Arthur, Bull. Torrey Club 44:504. 1917. 

 On Rosaceae: 



Duchesnea Indica (Ards.) Focke, II, Newark, May 1908, H. S. 

 Jackson; III, Wilmington, Nov. 1, 1890, A. Commons (1686). 

 This species and the following possess only uredinia (primary and 

 secondary) and telia in their life cycle differing from the commoner 

 species occurring on Rubus and Rosa in the absence of any Caeoma 

 stage. As sugge.sted by Arthur (Phytopath. 6:100. 1916; Bull. Torrey 

 Club 44:501-511. 1917) their aflfinities are with Phragmidium rather 

 than with Kuehneola which doubtless belongs in the Uredinaceae. In 

 the classification of the Uredinales based on the length of life cycle, 

 proposed by Arthur (Result. Sci. Congr. Bot. Vienna in 1906) these 

 species would represent a genus in the Phragmidiatae bearing the same 

 relation to Phragmidium and Earlea that Bullaria does to Dicaeoma, 

 and Dasyspora in the Dicaeomatae. Frommea Arthur (1. c.) has been 

 proposed as the name of this genus. 



.31. Phragmidium triarticulatum (B. & C.) Farl., Bull. Bussey Inst. 

 1:433. 1876. 

 Aregnia. triarticulatum Berk. & Curtis; Berk. Grevillea 3:51. 1874. 

 KueJineola obfnsa Arthur N. A. Flora 7^:185. 1912. p. p. 



