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. Jamesii, with no 
infection.^® 
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 Eriophorum viridi-carinatiim. 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 angustata 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. 
TranzscheP^ has reported the infection in 1907 of Ligularia 
sibirica (Senecio cacaliaefolius) and Senecio paluster (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. Holway, 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. 1912 ; and 7 ; 66, 78. 1915. 
11 Beitrage zur Biologic der Uredineen, III. 
