278 Evans: HEpATICAE OF PUERTO RICO 
tions sterile or soon again floriferous; bracts obliquely spreading, 
more or less complicate, the lobe as in the leaves but. usually a 
little smaller, measuring about 0.35 X 0.07 mm., lobule ovate, 
0.17 mm. long, 0.03 mm. wide, bidentate at the apex, otherwise 
subentire; perianth obovoid, 0.4 mm. long, 0.2 mm. wide, rounded 
at the apex and bearing a short beak, inflated and five-keeled in 
the upper part, the keels sharply denticulate from high-conical 
cells, surface between the keels sometimes smooth but usually 
more or less roughened like the keels: o inflorescence occupying 
a short branch or terminal on a longer branch, rarely proliferating; 
bracts contiguous but scarcely imbricated, the lobe as in the 
leaves but shorter and narrower, lobule reduced to a small basal 
fold; antheridia borne singly: capsule about 0.1 mm. in diameter; 
spores 9u in short diameter; elaters 54 wide. (PLATE 12, FIGURES 
17-26.) 
On leaves and logs. Without definite locality, Sintenis (4). 
North slope of the Luquillo Mountains, Heller (4647, in part). 
El Yunque, Evans (13). The species is also known from Cuba, 
Wright, Underwood, and from Trinidad, Crueger. Although . 
Gottsche first applied the name Lejewnea sicaefolia to the plant 
from Trinidad, the specimen collected by Sintenis should be re- 
garded as the type of the species, because it was from this that the 
first published description was drawn. The determination of the 
specimens described above was confirmed by Stephani. 
Rudimentary leaves are very frequent in A. sicaefolia. The 
leaves subtended by branches seem to be invariably of this type, 
and the same is true of the leaves at the base of a vegetative 
branch. These statements, however, do not apply to perichaetial 
bracts and subfloral innovations. In many cases, also, rudi- 
mentary leaves are scattered irregularly among normal leaves and | 
show no connection with branches. In a well developed leaf the 
lobe is more than three times the length of the lobule. In the 
basal part, where it helps to form the water sac, it is plane or 
nearly so, but the free apical portion is usually irregularly curved 
or twisted and also distinctly concave, the antical margin being 
curved in such a way that the marginal denticulations extend 
upward instead of outward. In typical cases the interior cells of 
the free portion resemble the marginal cells in being conical and 
often show a slight thickening of the wall at the apex of the cone, 
but these conical cells may be few or absent altogether and are 
