ENDOPHYLLUM-LIKE RUSTS OF PORTO RICO 
51 
Teliospores catenulate, one-celled, germinating at the apex of the 
column. 
Type species, Endophylloides portoricensis, on Mikania cordifolia. 
This form differs markedly from Endophyllum in that the latter is 
much more aecidium-like, with usually prominent peridium-cup and 
pulverulent masses of spores. Similarly, while undoubtedly resem- 
bling in some respects the type genus of Dietelia, D. verruciformis P. 
Henn., yet we regard the absence of an evident peridium and the pos- 
session of comparatively long, horny columns of teliospores in Endo- 
phylloides, in contrast to the strongly developed peridial cells and the 
globose or subglobose telia in Dietelia, as sufficiently distinctive to 
warrant the formation of the new genus. 
Endophylloides portoricensis Whetzel & Olive, sp. nov. 
Aecidium expansum Arth. Mycol. 7; 317. 1915 (not A. expansum 
Diet). 
O. Pycnia probably not formed. 
III. Telia chiefly hypophyllous, sometimes petiicolous or cauli- 
colous, short-cylindrical, forming more or less waxy or horny columns 
about 3^ mm. in diameter by 0.5-1 mm. long, aecidioid, borne in irregu- 
larly shaped areas, 0.5-1 or more cm. in diameter; peridial cells in- 
conspicuous, often collapsed, scarcely forming a continuous peridium; 
teliospores rounded or oval, 12-15 by 15-20 ju, in long persistent chains, 
separated from each other by prominent intercalary cells. 
On Compositae: 
Mikania cordifolia (L. f.) Willd., Porto Rico (Whetzel & Olive, 
No. 83, type, figs. 7-10). 
Mikania odoratissima Urban, Porto Rico. 
The first host is found very commonly all over the Island; and the 
fungus is also quite generally distributed. Mikania odoratissima, on 
the other hand, is, in our experience, much rarer. Our collections of 
the latter were made only on the mountain slopes of El Yunque and 
El Duque, at the extreme eastern end of the Island. 
Brooklyn Botanic Garden and Cornell University 
