116 



Mycologia 



known from South America but new to North America, besides 

 many new hosts and much extension of range for numerous other 

 species, is certainly a fine showing for a country whose width from 

 ocean to ocean is not half the distance from Chicago to Detroit, 

 and for an area covered by observation not equal to the State of 

 Rhode Island. Doubtless a general exploration of the 23,000 

 square miles of territory embraced in Costa Rica will fully dem- 

 onstrate the great richness and importance of its rust flora, as 

 has been shown for certain flowering plants, insects, and other 

 natural history groups, both plant and animal. 



The study of the Costa Rican rusts has constituted a part of the 

 preliminary work on the rust flora of North America being 

 prosecuted as a special project at the Purdue Agricultural Ex- 

 periment Station, Lafayette, Ind. Credit is due to the several 

 members of the laboratory staff who during the last two years or 

 more have assisted in the work. 



Family: COLEOSPORIACEAE 

 I. Coleosporium Ipomoeae (Schw.) Burr, (on Convolvulaceae) 

 Ipomoea purga Hayne, Orotina, Dec. 30, 191 5, II, hi, 320. 

 Ipomoea sp., San Jose, Jan. 3, 1916, II, 358. 



The species was also detected in the phanerogamic herbarium 

 of the New York Botanical Garden, showing an abundance of 

 uredinia and telia on Pharbitis hederacea (L.) Choisy (/. heder- 

 acea Roth.) collected at San Jose, January 1896, A. Tonduz 

 7090. The aecia occur on pine leaves, but have not been collected 

 outside of the United States. 



2. Coleosporium Viburni Arth. (on Caprifoliaceae) 

 Viburnum sp., Volcan de Irazu, Jan. 21, 191 6, II, 451. 



A very local species, rarely collected, extending northward as 

 far as Wisconsin. The aecia have not yet been detected. 



3. Coleosporium Elephantopodis (Schw.) Thiim. (on 

 Carduaceae) 



Elephantopus hypomalacus Blake, Orotina, Dec. 29, 1915, II, 314. 

 A common rust, whose aecia are unknown. 



