Evans: HeEpaticar oF Pusrto Rico 31 
to widely spreading, simple or sparingly subdivided, usually with 
smaller leaves than the stem but not microphyllous : leaves imbri- 
cated, the lobe convex, often revolute at the apex, widely spread- 
ing, falcate, oblong-ovate, 0.75 mm. long, 0.5 mm. wide, antical 
margin arching partially or wholly across the axis, strongly out- 
wardly curved from the base to the apex, postical margin straight 
or slightly curved, forming an angle of go° or more with the keel, 
apex broad, rounded to very obtuse, margin entire or nearly so ; 
lobule ovate in outline, 0.35 mm. long, 0.2 mm. wide, the inflated 
portion occupying the basal half and forming a subhemispherical 
swelling occasionally extending beyond the free Margin, apical 
tooth rounded and often obsolete, rarely apparent without dissec- 
tion, sinus broad and shallow, adnate portion one cell across ; 
cells of lobe plane to somewhat convex, averaging 164 at the 
margin, 28 # in the middle and 35 y at the base, trigones distinct 
but not conspicuous, triradiate with acute, sometimes constricted, 
fays, intermediate thickenings occasional, oval: underleaves con- 
tiguous to slightly imbricated, plane or somewhat revolute at the 
apex, reniform, 0.5 mm. long, 0.75 mm. wide, straight or very 
slightly decurrent at the base, apex broad, rounded or truncate, 
Margin entire: inflorescence autoicous: Q branch more or less 
elongated, usually with several pairs of leaves; bracts obliquely 
Spreading, unequally bifid and commonly complicate, the lobe 
ovate-oblong, 1.4 mm. long, 0.7 mm. wide, not falcate, often re- 
flexed at the abruptly acute or apiculate apex, margin sharply and 
irregularly dentate especially in the upper part, the teeth averag- 
ing six on the antical margin and four on the postical, mostly one 
to four cells long and one or two cells wide at the base, lobule 
obcuneate from a narrow base, 0.6 mm. long, 0.2 mm. wide, acute 
°F apiculate at the apex, margin entire; bracteole free, ovate, 1.35 
mm. long, 0.85 mm. wide, bifid about one tenth with acute, tri- 
angular and often reflexed divisions. separated by an acute to ob- 
tuse sinus, margin irregularly dentate as in the bracts, usually with 
from four to eight teeth on each side and from one to three in the 
Sinus ; subfloral underleaf undivided, commonly dentate along its 
Toad apex ; perianth about half-exserted, obovate in outline, 1.4 
mm. long, 1 mm. wide, beak short, antical face plane or slightly 
depressed, wings of keels much interrupted, sparingly and irregu- 
larly dentate, the teeth rarely more than two or three cells long 
8M one or two cells wide at the base, wings of postical keels 
shorter and more rudimentary than the others: spike occupy- 
ng a short branch; bracts in about six pairs, strongly inflated, 
Subequally bifid, complicate with a strongly arched keel, the 
rounded to subacute at the apex, bracteoles similar to 
divisions 
the underleaves but smaller: mature sporophyte not seen (PLATE 
20) 
4, FIGURES 
