Evans: HEpaATICAE OF PuERTO RICO 557 
underleaves are undivided. The @ inflorescence is sometimes 
borne on a short branch and sometimes on a leading branch, but 
it is invariably subtended by one or two innovations. The bracts 
are similar to the leaves, but are sometimes sharply pointed. The 
perianth is sharply five-keeled, but is never provided with horns ; 
its surface is often roughened by projecting cells. In common 
with many other genera of the Lejeuneae the basal region of the 
perianth becomes elongated after fertilization and thus modifies to 
a considerable extent the form of the organ. Neither gemmae 
nor propagula have been noted in the genus. 
The affinities of Evosmolejeunea are not altogether clear, but it is 
hardly probable that it is closely related to any of the other genera 
treated in the present paper. It is introduced here largely for 
comparison with Cyrto/ejeunea, and the most important differences 
between the two genera have already been noted. It is probable 
that Chetlolejeunea and Pycnolejeunea are much nearer allies. 
The species of Hwosmolejeunea are commonly found on the 
bark of trees or on rotten logs, more rarely on shaded rocks or 
stones, In many cases they grow mixed with other hepaticae, 
usually Lejeuneae, but one finds, not infrequently, broad pure 
mats of considerable size. 
Three species of the genus are now known from Puerto Rico, 
viz: E. duriuscula, E. opaca and E. trifaria. The first two of these 
have a wide distribution in tropical America and are also known 
from the subtropical regions of the United States along the Gulf oy 
Mexico. £, trifaria is even more widely distributed, being found 
in nearly all the tropical regions of the globe. Since 4. durtus- 
cula and £. opaca have recently been described and figured by the 
writer,* nothing about them is noted here except their distribution 
on the island. £. #ifaria, however, is described in full. 
EvVOSMOLEJEUNEA DURIUSCULA (Nees) Evans 
On rotten logs. North slope of the Luquillo Mountains, 
Heller (4649 p.p., 4758). Also collected by Sintenis (52, 53). 
EvosMOLEJEUNEA OPACA (Gottsche) Steph. 
On trees and rocks. North slope of the Luquillo Moun- 
tains, Heller (4325, 4761 pp... Three miles east of Santurce, 
* Mem. Torrey Club, 8: 135~141. p/. 18, f. 12-23. pl. 19, f- I-17. 1892. 
