ARTHUR AND JOHNSTON: UREDINALES OF CUBA 109 
study of the rusts opens a field that is likely to prove very attrac- 
tive to Cuban scholars, as it has been to others not so familiar with 
insular conditions. 
Map of Cuba, with scale of miles, showing the provinces: A, Pinar del Rio; B, 
Habana; C, Matanzas; D, Santa Clara; E, Camagüey; Е, Oriente; С, Isle of Pines. 
Some of the principal cities and towns are also indicated. 
The microscopical study of the material on which this paper is 
based was done in the laboratory of the botanical department of 
the Purdue University Agricultural Experiment Station at 
Lafayette, Indiana, as part of the preliminary work on the rust 
portion of the North American Flora. Thanks are due to Pro- 
H. S. Jackson, chief of the department, and to his assistants, for 
their assistance. 
Family: Coleosporiaceae 
I. COLEOSPORIUM ELEPHANTOPODIS (Schw.) Thüm. Мус. Univ. 
953. 1878. 
ON CARDUACEAE: 
Elephantopus mollis H. B. K., EI Yunque, Baracoa (Prov. 
Oriente), March 12, 1903, Holway; La Cunagua, Isle of 
Pines, Feb. 19, 1916, II, Britton, Britton & Wilson 
14554; San Pedro, Isle of Pines, Feb. 12-March 22, 1916, 
II, Britton, Britton & Wilson 15808; Baracoa (Prov. 
Oriente), April 14, 15, 1916, Johnston 504, 507. 
The species is heteroecious, having aecia on leaves of pine. 
In tropical regions it is doubtless maintained by the repeating 
urediniospores. It occurs in Porto Rico, Jamaica, and St. Vin- 
cent, but is more abundant on the continents, both north and 
south, 
