214 BOTANICAL GAZETTE [march 



heterospora Berk, and Curt. An examination of the material shows 

 that a very few 2-celled teliospores are present. P. heterospora, 

 upon related Malvaceous plants, is characterized by the preponder- 

 ance of i -celled mesospores such as those upon Pavonia. 



Arthur (Mycologia 9:80. 191 7) has given a brief discussion of 

 the situation here. Uromyces pictus Thuem. upon Abutilon was 

 also found to possess a few 2-celled teliospores and was placed with 

 Pnccinia heterospora by Sydow (Monog. Ured. 2 158 and 356. 1910). 



Uromyces Montana Arth., Bot. Gaz. 39 ."386. 1905. — Telospora 

 montana Arth., Result. Sci. Congr. Bot. Vienne 346. 1906. 



The type collection of this species possessed also aecia, which 

 were at the time considered to belong with Uromyces Lupini 

 B. and C. Subsequent collections in Guatemala by Kellerman 

 and Holway, however, show the same association of aecia and 

 telia; furthermore, these aeciospores are larger and thicker walled 

 than the aeciospores of U. Lupini. The grouped arrangement of the 

 telia and the thin walls of the teliospores and their germination at 

 maturity indicate a short cycle form, but nevertheless it is con- 

 sidered probable that the aecia go with the telia. U. elatus Syd., 

 also upon Lupiniis, shows the same situation as regards association 

 of aecia with telia resembling those of a short cycle form. I am 

 indebted to Dr. Mains of Purdue for work upon this species. 



Uromyces Cupaniae Arth., Mem. Torr. Bot. Club 17:131. 

 1918. — Uredo cristata Speg., Anal. Soc. Ci. Argent 17:119. 1884. 



This rust, although short-cycled, is excluded from this group, 

 since, as noted by Arthur, it has marked affinities with other groups 

 of rusts rather than with the group herein treated. 



Conclusions 



Eleven species of Uromyces possessing only telia and pycnia, 

 or telia alone, are now considered to be present in North America. 

 These are found especially in the higher and warmer portions of the 

 continent, and occur upon 7 widely separated host families. 

 While these rusts form a group agreeing as to life cycle and 

 as to the 1 -celled character of the teliospores, it is not con- 

 sidered that phylogenetic interrelationship is thereby shown, 

 morphological evidence indicating rather that the relationship of a 



