Arthur: Cultures of Uredineae in 1910 



15 



cu r rant- Car^.r rusts belong here or not. My previous cultures^^ 

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

 and confused with that species. 



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

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

 sown April 7 on Onagra biennis and Meriolix serrulaia, with no 

 infection on the latter, but with abundant pycnia 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 pycnia showed on the Onagra April 23, and aecia May 5. A 

 duplicate sowing was made May 11, which gave a few pycnia on 

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

 abundance of pycnia appeared May 19, and aecia May 27.^^ 



In previous years this species of rust has been grown on 

 Onagra biennis and Gaura 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 Euthanua graniinifolia {Solidago lanceolata) and 

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

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

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

 nemoralis, Doellingeria unibellata and Aster paniculatus, with 



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

 14: 13. 1908. 



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

 11: 58. 1905; 12: 15. 1906; 13: 195. 1907; Mycol. i: 233. 1909; and 2: 222. 

 191 o. 



