536 Evans: HEeEpaTICAE OF PuERTO RIcO 
orbicular to reniform in outline (FIGURES I, 3, 11). They are 
broad at the apex and vary at the base from cordate to cuneate 
and long-decurrent, a considerable degree of variation sometimes 
occurring in a single species. The rhizoids, which are occasionally 
very abundant, are borne on a rudimentary basal disc. 
The female branch is exceedingly short, bearing a single rudi- 
mentary leaf with its underleaf in addition to the involucre and 
perianth (FIGURES I, 11). ‘All of these parts are so small that they 
are more or less completely hidden by the large foliage leaves. 
The flower innovates on one side, the innovation being short and 
simple. In autoicous species the innovation is sometimes occupied 
by a male spike. The perichaetial bracts are shortly and sub- 
equally bifid, the lobule in some cases being a little larger than the 
lobe, a remarkable and unique condition among the. Lesewneae 
(FIGURES 8, 9, 12, 13). Both lobe and lobule are entire and vary 
at the apex from rounded to apiculate. The bracteole is free and 
is sometimes truncate at the apex, sometimes retuse and some- 
times distinctly bifid (FIGURES 10, 14). 
The perianth bears a marked resemblance to that found in 
Odontolejeunea, It is obovate in outline and strongly compressed, 
the broad and low postical keel being rounded or biuntly two- 
angled in the upper part. The sharp lateral keels bear laciniate 
wings, and in certain species there are scattered laciniae on the 
postical surface. The apex of the perianth is distinctly beaked. 
The male spikes vary in position and in length ; they are some- 
times found on leading branches, when they tend to proliferate 
(FIGURE 3), sometimes on short branches, the growth of which 
they tend to limit (FicurE 4). The diandrous bracts are charac 
terized by a rounded lobeand a more or less pointed lobule. The 
bracteoles are usually restricted to the base of the spike and be- 
come very rudimentary when they extend toward the apex. Rudi- 
mentary bracteoles are somewhat unusual among the Lesewseat 
Ffolostipae but are also found in Stictolejeunea and in a few other 
genera. 
The relationship between the present genus and Lopholejeune™ 
is commented upon by Spruce. Both genera are characterized by 
fimbriate perianths, but in Lopholejeunea the plants are smaller and 
more deeply pigmented, the female inflorescence is borne 0 # 
