Evans: HeEpaticaAE OF Purrto Rico 545 
megalantha and L. erectifolia, although included in Cyc/ostipa, 
might perhaps be better placed among the species of Micro- 
Leeunea. In 1887, he transferred L. erectifolia to this subgenus 
and, in 1894, pursued the same course with Z. holostipa and L. 
megalantha. Even the removal of these three species does not 
leave a wholly uniform residue, and it is probable that the remain- 
ing species will in time be distributed among other genera of the 
Lejeuneae. In the light of our present knowledge, it seems wisest 
to restrict the name Harfalejeunea to the section Cardiostipa, fully 
recognizing the close relationship of this emended genus to certain 
of the Cyclostipae as well as to the genera Strepsilejeunea and 
Trachylejeunea. 
The genus Harpalejeunea as thus restricted is composed of 
small species, the majority of which are tropical, and it is appar- 
ently best represented in the tropical forests of America. The 
genus, however, is not restricted to the tropics. Several well- 
marked species are known from Patagonia and New Zealand, and 
ff. ovata (Hook.) Schiffn., which may be considered the type of 
the genus, is now known in western Europe from Norway to Por- 
tugal and in the eastern United States from Virginia to Georgia. 
Comparatively few of the species grow on living leaves and still 
fewer occur on rocks. Several species are found creeping over 
large caespitose hepatics, such as species of Bazzania or Schisto- 
chila, but the majority prefer the trunks of trees or rotten logs, 
where they either grow mixed with other prostrate hepatics or 
form pure thin mats of considerable extent. 
The leaves of Harpalejeunea are characterized by widely spread- 
ing, falcate-ovate lobes, which are gradually narrowed toward the 
apex. In some cases the apex, which is often reflexed, is extended 
asa long and slender acumen; in other cases it is more or less 
bluntly pointed. Intermediate conditions are frequent, and a con-’ 
siderable degree of variation may often be found in a single species. 
The margin of the lobe varies from entire to sharply spinose, and 
in this respect, also, certain species are exceedingly variable. The 
lobule is of fair size and is strongly inflated with an arched keel, 
the latter forming a distinct angle with the postical margin of the 
lobe. The free margin of the lobule is strongly involute, and the 
apex is tipped with a single projecting cell. Atthe proximal base 
