UREDINALES COLLECTED BY FRED J. 

 SEAVER IN TRINIDAD* 



J. C. Arthur 



No attempt has heretofore been made to enumerate the rusts of 

 Trinidad. The present list of 71 species makes a creditable be- 

 ginning. Probably two or three times this number may be found 

 when a more thorough exploration is made. Over 160 species are 

 already known for the island of Porto Rico, and about the same 

 number for Cuba. Porto Rico has not one tenth the area of Cuba, 

 and Trinidad has not quite one half the area of Porto Rico, but 

 has a diversified topography and nearness to the mainland that will 

 doubtless largely compensate for lessened area. 



The island of Trinidad lies so close to the coast of South 

 America that it is more properly considered a part of the southern 

 continent rather than of the northern. Its flora is excluded from 

 the volumes of the North American Flora. 



The collections made by Dr. Seaver were obtained during the 

 six weeks between March 1 and April 14, 1921. The visit to the 

 island was made in the company of Dr. N. L. Britton, 1 who sup- 

 plied a preliminary determination of the hosts in the field. The 

 hosts have since been checked over by Mr. Percy Wilson at the 

 herbarium of the New York Botanical Garden. 



It is worthy of note that although Dr. Seaver gave his chief 

 attention to other groups of fungi, yet he was able to secure 169 

 collections of Uredinales, which have yielded 71 species of rusts, 

 3 being new, or 4 including the one supplied by Mr. Nowell, as 

 well as quite a number that are little known. 



In the following list space has been economized by omitting the 

 exact localities, except for new species, and by referring to the 

 page of the seventh volume of the North American Flora, where 



* Contribution from the Botanical Department of Purdue University Agri- 

 cultural Experiment Station. 



1 For a detailed account of this trip, see Journal of the New York Botanical 

 Garden for May, 1921. 



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