Evans: HepaTicaE oF Puerto RIco 195 
Brownish or olive green, sometimes varying to pale green or 
yellowish, densely tufted: stems 0.3 mm. in diameter, copiously 
and irregularly branched, the branches widely spreading, often 
ascending : leaves densely imbricated, the lobe more or less con- 
vex, broadly falcate-ovate, 1.25 mm. long, 1 mm. wide, attached 
by an almost longitudinal line of insertion, antical margin arching 
across or just beyond axis, slightly incurved near base, then 
strongly outwardly curved to apex, postical margin straight or 
nearly so, often with a blunt fold near end of keel, apex rounded 
or obtuse, often apiculate, margin varying from entire to sharply 
dentate, the teeth in extreme cases reaching a length of four cells 
and a width of two cells at the base, each tooth tipped with a sharp 
cell having a strongly thickened outer wall; lobule narrowly 
ovoid, 0.5 mm. long, 0.2 mm. wide, tapering and more or less 
curved toward end of keel, strongly inflated, keel slightly rough- 
ened from projecting cells, free margin involute to beyond apex, 
then passing by a shallow and long sinus to end of keel, apical 
tooth short and somewhat pointed, strongly curved ; cells of lobe 
convex, averaging 18 y at the margin, 35 # in the middle and 45 pz 
at the base, rather thick-walled with large triradiate trigones sep- 
arated by narrow pits or sometimes by an oval intermediate thick- 
ening between two pits; ocelli 80 long, 35 # wide, commonly 
in a group of three, situated at the base of the lobe but separated 
from the line of insertion by one or two rows of cells: underleaves 
imbricated, broadly orbicular, 0.7 mm. long, 0.9 mm. wide, cuneate 
or subauriculate at the base, shortly bifid at the apex with obtuse or 
rounded sinus and broad rounded or apiculate lobes, margin vary- 
ing from entire to sharply and irregularly denticulate in the upper 
part: inflorescence dioicous: Q inflorescence on a short branch, 
innovating on one side, the innovation commonly floriferous ; 
bracts obliquely spreading, the lobe obovate, 1.25 mm. long, 0.95 
mm. wide, margin entire to dentate, the keel sometimes narrowly 
winged in the lower part, lobule oblong, 0.6 mm. long, 0.25 mm. 
wide, rounded to acute at the apex, margin entire ; bracteole free, 
obovate, 0.85 mm. long, 0.6 mm. wide, shortly bifid at the apex 
with connivent obtuse or rounded lobes and narrow sinus, margin 
entire or nearly so; perianth almost hidden by the bracts, cunet- 
form in outline with slightly bulging sides, 1.25 mm. long, 0.95 
mm. wide, antical face plane, postical keel low and rounded, apex 
broad and emarginate with an indistinct beak, lateral keels sharp, 
€xtended upward as broad, rounded or truncate auricles, entire or 
minutely and irregularly denticulate in the upper part and often 
apiculate at the outer angles, sometimes bordered by one or two 
Interrupted and very narrow wings: i inflorescence and mature 
Sporophyte not seen (PLATE 8, FIGURES 16-23). 
