Evans: HEPATICAE OF PuERTO RICO 547 
margin straight or nearly so, forming an angle of 90° or more 
with the keel, apex abruptly acute or apiculate, margin otherwise 
entire or sparingly and irregularly denticulate in the outer part ; 
lobule ovate, trapezoidal in outline, more or less inflated, especially 
in basal and carinal regions, keel arched, free margin dilated and 
sometimes involute near base, straight or a little curved in outer 
part, apical tooth usually consisting of two superimposed teeth, 
accessory teeth normally two, each consisting of a single project- 
ing cell, often indistinct or obsolete, sinus straight or nearly so, 
forming an angle of 135—-180° with postical margin of lobe; cells 
of lobe plane or a little convex, averaging 22 at the margin, 
40 X 30 in the middle and 55 x 45 at the base, trigones dis- 
tinct and usually conspicuous, triradiate, the rays either acute or 
dilated and rounded at the apex, intermediate thickenings numer- 
ous, circular or oval, pits usually distinct and often relatively 
broad: underleaves imbricated, broadly orbicular, 1-1.7 mm. long, 
rounded and narrowly revolute at the apex, gradually or abruptly 
cuneate toward the base, long-decurrent and attached by a strongly 
arched line, the decurrent portion sometimes minutely rounded at 
the very base, margin entire or minutely denticulate in apical 
region: inflorescence dioicous: © inflorescence terminating a 
secondary stem or a leading branch, innovating on both sides, the 
Mnovations obliquely spreading, simple or soon again floriferous ; 
bracts obliquely spreading, the lobe ovate-oblong, 2.2 mm, long, 
1.1 mm, wide, apex abruptly apiculate or acute, margin entire or 
sharply and irregularly dentate in the upper half, the teeth some- 
times numbering as many as twelve; lobule (maximum size) I 
mm. long, 0.65 mm. wide (often much smaller), ovate to lanceo- 
late, mostly acute and sometimes entire but usually irregularly 
dentate or lacerate ; bracteole free, obovate, 1.5 mm. long, I.25 
mm. wide, cuneate toward base, apex broad, rounded, retuse or 
shortly bifid, margin sharply and irregularly dentate in the upper 
Part ; perianth more than half exserted, obovate-oblong in outline, 
4mm. long, 2 mm. wide, apex truncate or slightly retuse, basal 
“gion cuneate: <j inflorescence and mature sporophyte not seen 
(PLATE 32) 
On trees, rotten logs, and rocks. North slope of the Luquillo 
Mountains, Heller (1145). El Yunque, vans (59). Mount 
Morales, near Utuado, Howe (1088, 1127, 71 90). The species is 
very abundant in the mountains of Jamaica, the type locality, 
Where it was originally collected by Swarts and more recently by 
Underwood and by the writer. The following localities may also 
be noted :— Mexico, Liebmann ; Cuba, Wright, Underwood, Mrs. 
