CULTURES OF UREDINEAE IN 

 1916 AND 1917 1 



J. C. Arthur 



The present article is the fifteenth in a series of reports 2 by the 

 writer upon the culture of plant rusts, beginning in 1899 and 

 completing nineteen consecutive years. The preparation of the 

 index and summary to the series, as stated in the report for last 

 year, has been delayed, but together with a general retrospect is 

 expected to appear in a succeeding number of this journal. 

 After this, if work of the present character is continued, it will 

 be reported in some other form. 



Field Observations in 1916 



The writer, by the courtesy of the botanical department of the 

 Indiana Agricultural Experiment Station now under the direction 

 of Professor H. S. Jackson, was enabled to make important 

 observations in the field during 1916, which have proved of the 

 utmost value, not only in detecting the alternate form of certain 

 heteroecious species, but in securing a more adequate conception 

 of the different aspects and range of hosts of particular species 

 when occurring under unlike conditions or in the midst of plant 

 societies composed of different elements. 



The first trip of the year was to State College, Pa., in the 

 last days of April, where Dr. F. D. Kern and his associates in 

 the botanical department of the Pennsylvania State College gave 

 every facility for a week's field work. Two excursions in the 

 vicinity are especially worthy of mention, both taken under the 

 personal direction of Professor C. R. Orton. An over-mountain 

 road took us to Charter Oak, where the locality for the amphi- 



1 Presented in part before the Botanical Society of America at the New 

 York meeting", December 29, 1916. 



2 See Bot. Gaz. 29: 268-276; 35: 10-23; Jour. Myc. 8: 51-56; 10: 8-21; 

 11: 50-67; 12: 11-27; 13: 189-205; 14: 7-26; Mycol. 1: 225-256; 2: 213- 

 240; 4: 7-33, 49-65; 7: 61-89; and 8: 125-141. 



294 



