ARTHUR AND JOHNSTON: UREDINALES OF CUBA 99 
imperfectly known to permit of their reference to a true genus, 
Even many of the 112 true species have one or more spore forms 
yet to be discovered in order to make the life cycle fully known, 
and to permit a full technical description. 
This first published list of Cuban rusts contains a fairly respec- 
table and representative number of species, as is evident by com- 
paring with the Porto Rican list of 110 true species and 42 others 
belonging to the form-genera Aecidium and Uredo. The rust 
flora of Porto Rico is the best known of all the West Indian islands. 
But Cuba is an island of thirteen times the area of Porto Rico. 
and with а more varied topography. It is evident, therefore, that 
the present showing must be accepted as only a beginning to the 
study of the Uredinales of Cuba. 
There have been available for the present study about 470 
collections, of which 57 were taken from specimens deposited in 
phanerogamic herbaria. These collections are represented in the 
Arthur herbarium. Only one species has been introduced into 
the list from published records, with no specimen available for 
examination, and that is the stem rust of wheat (no. 63), the best 
known and most cosmopolitan of all rusts. 
The largest contributors toward material for a list of Cuban 
rusts have been the men employed since 1904 at the Cuban Agri- 
cultural Experiment Station (Estación Experimental Agronómi- 
ca), located at Santiago de las Vegas, some score of miles from 
Havana. A large portion of the material has also been contrib- 
uted by members of the expeditions sent to Cuba by the New 
York Botanical Garden, beginning in 1903. In addition to these 
some material has come from individual collectors, mostly while 
engaged in securing phanerogamic specimens. 
Activity in the field of cryptogamic botany at the Cuban sta- 
tion began with the accession of Prof. F. S. Earle to the director- 
ship of the station in 1904, and the contemporaneous and sub- 
sequent appointment of able botanists to other positions. 
Professor Earle (1904-1906) gave chief attention to the fleshy 
fungi. Five collections of rusts are credited to him, representing 
as many species, and eight other numbers in association with 
other collectors. He retired from the station to his farm at Her- ` 
radura in the Province of Pinar del Rio, eighty miles to the west- 
