Lee a eee, Ge eee = 
Evans: HEpATICAE OF PuERTO RICO 549 
but in certain delicate forms the local thickenings are scarcely to 
be demonstrated. The underleaves are usually reflexed at the 
apex, but they are occasionally plane, and their margins vary from 
entire to denticulate. The bracts and bracteoles vary greatly with 
respect to their marginal teeth, and the lobules of the bracts vary 
not only in size but but also in form. Among the most constant 
characters of the species are the following: the apiculate or acute 
leaves, the tridenticulate lobules, the decurrent and usually reflexed 
underleaves, the more or less toothed bracts, and the toothed and 
bifid bracteole. Unfortunately even these characters are subject 
to some variation, but will usually serve to distinguish the species 
from its allies. The perianth is also a remarkably constant organ 
but presents no reliable differential characters. 
In the preceding description the inflorescence of I. brachiata 
is described as dioicous, because the specimens studied by the 
Writer have all been either sterile or purely archegonial. Spruce 
also admits that the inflorescence in L. Bongardiana is dioicous but 
implies that it is normally autoicous in his somewhat doubtful Z. 
Guilleminiana. Gottsche * also ascribes a monoicous inflorescence 
to the same species. It would perhaps be more accurate, there- 
fore, to describe the inflorescence as polyoicous. Gottsche gives 
but few details about the antheridial spike. He says that it is 
either terminal on a branch or intercalary, that the bracts are in 
eight to ten pairs, and that the antheridia are borne singly or in 
pairs. . 
MASTIGOLEJEUNEA 
The genus Mastigolejeunca is very widely distributed in trop- 
ical and subtropical regions and contains from thirty to thirty- 
five recognized species. The majority of these grow on trees 
or on logs, but a few are sometimes found on rocks. The genus 
is apparently confined to low altitudes, from the sea level up to 
two thousand feet. The first species mentioned by Spruce and by 
Schiffner is M. auriculata (Wils. & Hook.) Schiffn. This may 
therefore be considered the type of the genus. At the present 
time it is the only species known to occurin Puerto Rico. In fact 
no other species have been recorded from North America, if we 
Se 
* Mex. Leverm. 171. 1863. 
