Arthur: Uredinales of Porto Rico 
171 
was not represented in the Stevens collection. We may say, there- 
fore, that the present known rust flora of Porto Rico numbers 
I2I species or, eliminating possible duplication (ten species of 
Aecidium) , in species. 
From all the other West Indian islands (excluding Trinidad) 
an additional nineteen species have come to light, which are 
given in a separate list. This makes 140 species of rusts for the 
West Indies, or by omitting undistributed aecia 130 species. 
Doubtless a few species already recorded have been overlooked. 
Unquestionably many species yet await the collector. 
The writer desires to express his appreciation of Dr. Stevens’ 
courtesy in supplying his material so unreservedly for study, and 
for information of various kinds regarding the island flora. He 
also wishes to extend thanks to the staff of the New York 
Botanical Garden, and to Prof. A. S. Hitchcock, Agrostologist 
of the U. S. Department of Agriculture, and to others who have 
assisted in the determination of the hosts. Especial recognition 
is due Mr. Percy Wilson of the N. Y. Bot. Garden for the 
unlimited patience and ready acumen, which he brought to bear 
in working over the great number of fragmentary specimens, and 
searching out corroborative or illustrative material from the 
phanerogamic herbarium, in order to determine the hosts with 
certainty and to extend knowledge of the range of the rusts. 
Family : Coleosporiaceae 
I. CoLEOSPORiUM Elephantopodis (Schw.) Thiim. Myc. Univ. 
953. 1878. 
On Carduaceae: 
Elephantopus mollis H.B.K., IMaricao, Jan. 10,* 201, Jan. 
15, 287, April 3, 869] Corozal, Feb. 21, 411', Yauco, 
Oct. 3, 3154, 3248; Jajome Alto, Dec. 3, 3638; Jayuya, 
Dec. 17, 5997; Mayagiiez, Dec. 25, 6294; River junc- 
tion below Utuado, Dec. 30, 6600a; St. Ana, Dec. 31, 
6623; Preston’s ranch near Naguabo, Dec. 31, 6682; 
without locality or date, 313. 
* All dates in citation of the Stevens Porto Rican material are to be con- 
sidered in the year 1913, unless otherwise stated. 
