359 



ecious. He repeatedly infected Xanthium seedlings by inoculating with 

 teliospores from same host but was unable to infect Ambrosia trifida. 

 He believes this species to be distinct from the form on A)iibrosia trifida. 



In 1905 and 1906 Arthur (Jour. Myc. 12:20. 1906; 13:198. 1907) 

 confirmed Carleton's work. He also failed to infect Ambrosia trifida 

 with spores from Xanthium. No pycnia have been found in herbarium 

 specimens nor did they develop in the cultures recorded above. 



It is evident from these culture experiments that we have here a 

 rust, while morphologically indistinguishable on the two host genera, 

 yet exists in two independent races. 



97. Ravenelia epiphylla (Schw.) Dietel, Hedwigia 33:27. 1894. 

 Sphaeria epiphylla Schw. Schr. Nat. Ges. Leipzig 1:40. 1822. 



On Fabaceae: 



Cracca virginiana L., Townsend, June 11, 1890, A. Commons 

 (1438). 



98. Tranzschelia punctata (Pers.) Arth. Result Sci. Congr. Bot. 



Vienna 340. 1906. 

 Aecidium punctatum Pers. Ann. Bot. Usteri 20:135. 1796. 

 Puccinia Pruni-spinosae Pers. Syn. Fung. 226. 1801. 

 On Ranunculaceae : I. 



Anemone quinquefolia L., Newark, May 8, 1897, F. D. Chester, 



May 10, 1907, (1656). 

 Hepatica Hepatica (L.) Karst, Faulkland, May 3, 1884, A. 

 Commons, Newark, May 22, 1907, (1566), May 1908, (2254). 

 On Amygdalaceae : II, III. 



Prunus serotina Ehrh., Greenbank, Aug. 24, 1886, A. Commons 

 (26). 

 Dr. Tranzschel in 1904 (Trans. Mus. Bot. Acad. St. Petersb. 11 :67- 

 69. 1905) first showed that Aecidium ptmctatum on Anemone was the 

 aecial stage of P. Pruni-spinosae. He succeeded in obtaining the char- 

 acteristic uredinia of this species on Amygdalus communis, Prunus 

 spinosa and P. divaricata following sowings with aeciospores from Ane- 

 mone coronaria. Aecia on Anemone ranuncii hides were also used to 

 infect Prunus spinosa with similar results. 



In America Arthur in 1905 (Jour. Myc. 12:19. 1906) showed that 

 this species has its aecia on Hepatica acutiloba {Aecidium Hepaticuin 



