1 
170 Mycologia 
Uredo, which doubtless belong in this family. One of these 
forms, Uredo fenestrala, possesses a peridium having elongated 
cells at the sides and isiodiametric cells above, as in the genera 
Schroetcriaster and Hyalopsora. The other four forms. Nos. 
105, 106, 107 and 108, have a pseudoperidium formed of imbri- 
cated paraphyses, which indicates a position near Kuehneola and 
Physopella. Possibly the fern rust, Uredo Gymnogrammes, also 
belongs near these forms. If all these were to be counted in, we 
would have eleven species under the family Uredinaceae. 
The family Aecidiaceae (Pucciniaceae) contains the chief part 
of the Porto Rican rusts. There are sixty-three species so 
assigned in the following enumeration, of which one, Pticciniosira 
pallidula, is usually placed under the Uredinaceae, but is here 
shifted to the Aecidiaceae on account of the structure of the 
sorus. To these sixty-three should be added the species under 
the form-genus Aecidium, and such of those under Uredo as 
have not just been assigned to the other families, or eighty-five spe- 
cies in all. It is probable, however, that some of the species under 
the two form-genera merely represent stages of species already 
named under Uromyces or Puccinia. It almost amounts to a 
certainty that the ten species of Aecidium represent aecial forms 
to be distributed among the fifteen grass and sedge rusts enu- 
merated, or those yet to be found. It is doubtless safe to 
assume, that omitting the names eventually to be reduced to 
synonymy, we ought to have remaining from this list about 
seventy-five species under the family Aecidiaceae. 
The collection made by Dr. Stevens proved so representative 
of the Porto Rican rust flora in particular and of the West Indian 
in general that it has required little additional space to mention 
all other collections from the region known to the writer. No 
careful attempt has been made to secure all references made in 
literature, where the material was not available for examination. 
It is believed, however, that the presentation here made is a 
fairly exhaustive record of the West Indian Uredmales. After 
the enumeration of species in the Stevens collection, a list of 
twelve species is given, which embraces all material from Porto 
Rico secured by other collectors, so far as the writer knows, that 
