Davis: Urocystis agropyri on Redtop 281 



light amber to a Brussels-brown, are oblong-spheric to sub-spheric, 

 covering the fertile cell or cells. The spores vary from i to 4 in 

 a spore ball, usually 1 or 2. The fertile spores are Brussels- 

 brown, oblong-spheric to spheric or angular-spheric. The sides of 

 the spores are often flattened where two or more are crowded to- 

 gether in a spore ball. The spores are 12 to 19^ in length; the 

 average length of 20 measured was 16 /a. Thus the spores and 

 spore balls compare very favorably with those of U. agropyri as 

 described by Clinton (1. c). 



Specimens were deposited in the Herbarium at the University 

 of Wisconsin. The identification of the smut was verified by Dr. 

 J. J. Davis, Curator of the Herbarium at the University of Wis- 

 consin. 



Department of Botany, 

 Mass. Agr. College, 

 Amherst, Mass. 



