184 



Arthur: Cultures of Uredineae in ic)r 16 



cur rant- Car ex rusts belong here or not. My previous cultures 16 

 of this form have been reported under the name P. albiperidia, 

 and confused with that species. 



2. Pucctnia Peckii (DeT.) Kellerm., on Carex lanuginosa 

 Michx., collected at Kulm, N. D., by Dr. J. F. Brenckle, was 

 sown April J on Onagra biennis and Meriolix serrulata, with no 

 infection on the latter, but with abundant pyenia on the former 

 April 16, and aecia April 25. 



Another collection on Carex trichocarpa Muhl., made at Car- 

 mel, Ind., by Messrs. F. D. Kern and A. G. Johnson, was sown 

 April 13 on plants of the same two species of hosts with similar 

 results. There was no infection of the Meriolix, but abundance 

 of pyenia showed on the Onagra April 23, and aecia May 5. A 

 duplicate sowing was made May II, which gave a few pyenia on 

 the Meriolix, but no aecia developed, while on the Onagra 

 abundance of pyenia appeared May 19, and aecia May 27. 17 



In previous years this species of rust has been grown on 

 Onagra biennis and Ganra biennis, the two hosts being very simi- 

 lar in vegetative structure. Aecia have been gathered in the field 

 on a number of related hosts with less similarity in vegetative 

 structure, such as Meriolix, but heretofore no cultural studies 

 have been made. The present attempt may be interpreted as 

 indicating that certain outlying hosts are infected only under 

 exceptionally favorable circumstances, or that there exist more 

 or less well marked races. 



3. Puccinta Caricis-Solidaginis Arth., on Carex scoparia 

 Schk., collected by the writer at Isle au Haut, Me., was sown 

 April 20, on Euthamia graminifolia (Solidago lanceolata) and 

 Solidago rugosa, with infection only on the former, abundance of 

 pyenia showing April 30, and aecia May 9. Another sowing was 

 made June 10 on the same two hosts, and on 5*. canadensis, S. 

 nenwralis, Docllingeria umbellata and Aster paniculatus, with 



16 See Jour. Myc. n : 58. 1905 (in part); 12: 14. 1906; 13: 196. 1907; and 

 14: 13. 1908. 



17 For previous cultures see Bot. Gaz. 35: 13. 1903; Jour. Myc. 8: 52. 1902; 

 n : 58. 1905; 12: 15. 1906; 13: 195. 1907; Mycol. 1: 233. 1909; and 2: 222. 

 1910. 



