349 



Bubak (Cent. Bakt. 10=: 574. 1903) has shown by cultures that the 

 European P. argentata has its aecial stage on Adoxa moschatellina. 

 Arthur in 1910 (Mycol. 4:20. 1912) successfully infected Impatiens 

 aurea by sowing with aeciospores from Adoxa moschatellina collected 

 in Iowa, thus proving the American and European rusts are the same. 



75. PUCCINIA OBTECTA Pk. Bull. Buffalo Soc. Nat. Hist. 1:66. 1873. 

 Aecidium compositurnm. Bidentis Burrill; DeToni, in Sacc. Syll. 



Fung. 7:799. 1888. 



On Cyperaceae: 



Scirpns flnviatilis (Torr.) A. Gray? Wilmington, Nov. 5, 1885, 



A. Commons (1076). 

 Scirpiis americanns Pers., Wilmington, Oct. 11, 1889, A. Com- 

 mons (1026). 

 Arthur in 1907 (Jour. Myc. 14:20. 1908) has shown that P. obtecta 

 Pk. has its aecial stage on Bidens. Successful sowings of teliospores 

 from A. americanns collected in Indiana were made on B. frondosa and 

 B. comata. 



76. PUCCINIA ORBICULA Pk. & Curt. Ann. Rep. N. Y. State Mus. 30:53. 



1879. 

 On Cichoriaceae: 



Nabalus sp., Newark, 1907, M. T. Cook. 



77. PUCCINIA Pammelii (Trel.) Arth. .Jour. Myc. 11:56. 1905. 

 Puccinia Panici Diet. Erythea 3:80. 1895. 



Aecidium Pammelii Trel. Trans. Wis. Acad. Sci. 6:136. 1885. 

 On Poaceae: 



Paniciim virgatum L., Selbyville, Oct. 4, 1907, (1789). 



Stuart (Proc. Ind. Acad. Sci. 1901:284. 1902) shows by cultures 

 that Aecidium Patnmelii on Euphorbia corollata is the aecial stage of 

 P. panici. These results were confirmed by Arthur in 1904 and 1905 

 (Jour. Myc. 11:56. 1905; 12:16. 1906) by sowing telial material on 

 P. virgatum from Indiana, on E. corollata with resulting infection and 

 development of aecia. In 1907 (Jour. Myc. 14:16. 1908) successful 

 infection on E. macidata was obtained following sowings of teliospores 

 from the same host collected in Nebraska. At the same time negative 

 results were obtained on E. corollata. These results indicate the presence 

 of physiological races in this species. 



