VOLUME LXIX 



NUMBER 3 



THE 



Botanical Gazette 



MARCH 1920 



SHORT CYCLE UROMYCES OF NORTH AMERICA 1 



G. R. Bis by 



(with plate x) 



The short cycle Uromyces may be segregated as a group by utiliz- 

 ing the criteria of life cycle and character of teliospores. Aside 

 from any question of the validity of such bases for segregation, it 

 is evident that it is a common practice thus to set apart this group, 

 and that an opportunity is thereby afforded to consider relationships 

 of such rusts to each other and to other rusts. 



The short cycle Uromyces are of considerable interest, although 

 as yet comparatively few species or even collections are recorded 

 for North America. These rusts occur over a wide geographical 

 range, however, and are parasitic upon widely separated families 

 of hosts. 



The writer has been privileged to examine the excellent collec- 

 tion of short cycle Uromyces in the herbarium of Dr. J. C. Arthur. 

 This paper represents the results of the study of the group as made 

 primarily for the North American Flora, but is presented separately 

 in order to give notes and discussions not permissible in that 

 publication. 



1 Abstract submitted before American Phytopathological Society at the New 

 York meeting, and published in Phytopathology 7: 74. 1917. Contribution from 

 Botanical Department of Purdue University Agricultural Experiment Station. 



193 



