58 Mycologia 



ing spore stage. Some advance was made in the case of another 

 form, Uredo Plucheae, by the discovery of aecia associated with 

 the uredinia, but telia must be found before the true generic posi- 

 tion is assured. Material was also provided, which permitted 

 the assignment of two Uredo-iorms to a genus of striking and 

 highly distinctive characteristics. This new genus is dedicated 

 to one of the collectors in recognition of his important contribu- 

 tions to the fundamental understanding of the evolution of the 

 Uredinales, and also as a tribute to the notable success of the 

 expedition. 



As the present paper may be considered in a way a continua- 

 tion of the Porto Rican rust flora, as begun in the report on the 

 Stevens collections (Mycol. 7: 168-196, 227-255, 315-332; 8: 

 16-33. I 9 I 5~ I 6), the same form of treatment has been used 

 as in that paper, but with omission of both citation and synonymy 

 for both the rusts and hosts appearing in that list. For species 

 not occurring in the Stevens list, however, citations and synonymy 

 are given. When a species is listed here under a different name 

 than in the Stevens list, it is followed by the previously used 

 name in parenthesis without citation. 



/ 



Family : Coleosporiaceae 



1. Coleosporium Elephantopidis (Schw.) Thiim. 



On Carduaceae: 



Elephantopus mollis H. B. K., Mayagiiez, Feb. 29-Mar. 

 6, II, 151} 



2. Coleosporium Ipomoeae (Schw.) Burr. 



On Convolvulaceae : 



Ipomoea angustifolia Jacq., Campo Allegra, April 21, II, 

 306. 



Ipomoea Batatis (L.) Lam., Barceloneta, April 6, II, 304; 



El Yunque, April 14, II, 303, 305. 

 Ipomoea rubra (Vahl) Millsp., Rio Piedras, April 11, II, 



iii, jop; El Yunque, April 14, II, 308. 

 Ipomoea stolonifer (Cyrill) Poir., Santurce, April 24, II, 



307- 



1 All numbers of the Whetzel-Olive set are collections made in the year 

 1916. 



