319 



11. Melampsora Bigelowii Thum. Mitth. Forstl. Vers. 2:37. 1879. 

 Uredo Bigelowii Arth. Result. Sci. Congr. Bot. Vienne 338. 1906. 



On Salicaceae: II, III. 



Salix nigra Marsh., Wilmington, Oct. 4, 1889, A. Commons 

 (1022); Newark, Oct. 6, 1905 (1634), Sept. 10, 1907 (1729). 

 Arthur in 1903 (Jour. Myc. 11:60. 1905) was the first to show that 

 this American species, like certain European forms on Salix, develops 

 its aecial stage on Larix. He obtained the development of aecia on 

 Larix decidua by using for infection, telial material on Salix amygda- 

 loides, from Wisconsin. These results were confirmed in 1906 (Jour. 

 Myc. 13:194. 1907) when similar successful infection was obtained on L. 

 decidua following exposure to germinating telia on Salix sp. from In- 

 diana. Wier and Hubert (Phytopath. 6:372. 1916) used telia on Salix 

 Bebbiana from Montana to successfully infect L. occidentalis, and on 

 S. cordata mackenzieana from Idaho to infect L. Europea. Pj^cnia and 

 aecia developed in abundance from both infections. (See also Phyto- 

 path 7:109. 1917; 8:326. 1918.) 



12. PucciNlASTRUM Agrimoniae (Schw.) Tranz. Script. Bot. Hort. Univ. 

 Petrop. 4:301. 1895. 



Caeoma Agrimoniae Schw. Trans. Am. Phil. Soc. II, 4:291. 1832. 

 On Rosaceae: II, III. 



Agrimonia hirsuta (Miihl.) Bicknell, Newark, Sept. 19, 1905, 



(1547); Oct. 1907 (2235). 



No culture work leading to the detection of the alternate form of the 



species has been conducted. The aecia, in common with other North 



American species of Pucciniastrum, doubtless occur on the leaves of 



Abies or Tsuga. 



13. Pucciniastrum minimum (Schw.) Arth. Result. Sci. Congr. Bot. 



Vienne 337. 1906. 

 Uredo minima Schw. Schr. Nat. Ges. Leipzig 1:70. 1822. 

 Peridermium Peckii Thiim. Mitth. Forstl. Vers. Oest. 2:320 (24). 

 1880. 



On Ericaceae: II. 



Azalea viscosa L., Collins Beach, Oct. 1, 1907 (1910). 

 Eraser in 1910 (Mycol. 4:184. 1912) was the first to show that 

 the alternate host for this species is Tsuga canadensis. He obtained sue- 



