44 



(Reprinted from the Journal of Mycology, 11 : 50-G7, March 190o 



CULTURES OF UREDINEAE IN 1904. 1 



J. C. ARTHUR. 



The present article forms the fifth of a series of reports 2 by 

 the author upon the cultures of plant rusts. They cover the years 

 from 1899 to tne present year inclusive. In these studies the grass 

 and sedge rusts hold a prominent place, but some other heteroe- 

 cious and a few autoecious rusts have been included. 



During the period when the cultures are in progress, the con- 

 stant attention of one person is required to assort the material 

 which is in germinating condition from that not yet ready to germ- 

 inate, to sow the spores, to maintain a careful watch for the first 

 appearance of the spermogonia and aecidia, and to keep the rec- 

 ords with unimpeachable accuracy. At the beginning of the pres- 

 ent season the Indiana Experiment Station established a cooper- 

 ative agreement with the Bureau of Plant Industry of the U. S. 

 Department of Agriculture to mutually assist in carrying on the 

 annual culture work. Through the government assistance Mr. 

 F. D. Kern, a senior student from the University of Iowa, recom- 

 mended by Professor T. H. MacBride, was secured to take charge 

 of the cultures. Mr. Kern proved an exceptionally able man for 

 the position, having unusually keen and accurate powers of observ- 

 ation, a retentive memory, and scholarly enthusiasm. Mr. Kern's 

 work extended through May, and a part of April and June. 



1 Read before the Botanical Society of America, Philadelphia, Decem- 

 ber 30, 1904. 



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

 and Jour. Mycol. 10:8-21. 



