i9*5 M 



Arthur: Cultures of Uredineae in 1915 131 



tion, upon Carex durifolia, a species from which the aecia were 

 supposed to have been derived, and also upon C. lame six, with no 

 infection. 10 



3. Puccinia Eriophori Thiim. Observations by Dr. H. D. 

 House of the New York State Museum, made near Oneida, N. 

 Y., in June of this year, led to the recognition of this species of 

 rust in America and the discovery of the alternate stage. On 

 June 27 Dr. House wrote that "of thousands of plants of Senecio 

 in the marsh practically every one is affected by the Aecidium." 

 He found that of the numerous marsh plants the one having a 

 corresponding abundance of rust on the dead leaves from the 

 preceding year was Eriophonim viridi-carinatum. At the same 

 time he sent growing plants of both the Senecio and Eriophorum, 

 the former with leaves well spotted with aecia. All the plants 

 continued to flourish. 



On June 30 a sowing of aeciospores from Senecio aureus was 

 made on the young leaves of Eriophorum viridi-carinatum. After 

 twenty-four hours a test of the spores remaining on the leaves of 

 the Eriophorum showed that from twenty to forty per cent, of 

 them were germinating. Daily observation of the plant was not 

 made, but on July 15 both uredinia and telia were found to be 

 present. The rust on American species of Eriophorum is mor- 

 phologically very similar to Puccinia angtistata Peck on various 

 species of Scirpus, and usually has been listed under that name. 

 As P. angustata has its alternate stage on the labiate, Lycopus, 

 the same had been supposed to be true of the rust on Eriophorum, 

 and thus to differ from the similar rust in Europe. 



Tranzschel 11 has reported the infection in 1907 of Ligularia 

 sibirica (Senecio cacaliaefolius) and Senecio palustcr (Cineraria 

 palustris) from teliospores on Eriophorum angustifolium, and has 

 listed the European stations for the rust, showing that it is quite 

 rare. In America it has been taken on Eriophorum angustifolium 

 Roth, at Decorah, Iowa, June 29, 1884, E. W . D. Hohvay, Ken- 

 nedy, Neb., July 20, 1892, /. M. Bates, Newfane, Vt., Oct. 16, 



10 For previous cultures see Jour. Mycol. 12: 58. 1905; 12: 14. 1906; 13: 

 196. 1907; 14: 13. 1908 ; Mycol. 4: 13. 19 12 ; and 7 : 66, 78. 1915. 



11 Beitrage zur Biologie der Uredineen, III. 





