30 



Reprinted from the Journal of Mycology, 10:S-21. Jan., 1903. 



CULTURES OF UREDINEAE IN 1903. ] 



J. C. ARTHUR. 



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

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

 years from 1899 to the present inclusive. This report is devoted 

 both to . autoecious and heteroecious species, among which the 

 grass and sedge rusts have had a prominent place. The number 

 of species studied and the number of cultures made have fallen 

 off somewhat from .last year, partly because it was late in the 

 spring before assistance vVas secured to carry on the work, and 

 partly because a less number of collections of teleutospores and 

 field observations were obtained upon which to base the work. 

 The results however, fully equal in interest and importance those 

 of last year, or possibly exceed them. 



The expense of additional assistance in carrying on the 

 work, and to some extent the expense of procuring material, was 



1 Read before the Botanical Society of America, St, Louis, December 

 30, 1903. 



l See Bot. Gaz. 29:268-276; Jour. Mycol. 8:51-56; and Bot. Gaz. 

 J5:10-23. 



