62 



Reprinted from the Journal of Mycology, 1:11-57 January 1906 



CULTURES OF UREDINEAE IN 1905. 1 



BY J. C. ARTHUR. 



The present article forms the sixth of a series of reports 2 

 by the author upon the culture of plant rusts. They cover the 

 years from 1899 to the present year, inclusive. In these studies 

 the grass and sedge rusts hold a prominent place, but other hete- 

 roecious and autoecious species have been included, and during 

 the present season the work has been extended to the so-called 

 opts, micro and lepto forms, and also to species with amphi- 

 spores. 



The cooperative agreement between the Bureau of Plan 

 Industry of the U. S. Department of Agriculture and the Indiana 

 Experiment Station, which existed for carrying on the culture 

 work in the spring of 1904, was again established, extending 

 from July, 1904, to April 30, 1905, making it possible to have 

 an assistant during this period, who devoted nearly his whole 

 time to the study of the rusts. The position was first held by 

 Mr. J. C. Marquis, who was succeeded on October 1, 1905, by 

 Mr. Frank D. Kern, and after the expiration of the cooperative 

 agreement Mr. Kern was retained by the Experiment Station to 

 continue the work. After May 10 all the work fell upon Mr. 

 Kern until September, covering the most important part of the 

 culture period, the author being absent in Europe. It could not, 

 however, have been entrusted to better hands, as the fine ability 

 displayed in the work during the previous season, coupled with 

 considerable experience already acquired, enabled him to meet 

 the new conditions as they arose, and the judgment and caution 

 indispensable in securing authoritative results. 



Much of the completeness of the work is due to the kindly 

 assistance of correspondents, who have sent teleutosporic mate- 

 rial, and especially to Messrs. E. Bethel, Denver, Colo. ; J. M. 

 Bates, Red Cloud, Neb. ; A. O. Garrett, Salt Lake City, Utah ; 



1 Read before the Botanical Society of America at the New Orleans 

 meeting, January 1, 1906. 



'See Bot. Gaz. 29: 268-276; Jour. Mycol. 5:51-56; Bot. Gaz. 35' 

 10-23; Jour. Mycol. 10: 8-21 and 11: 50-67. 



