548 Evans: HEPATICAE OF PuERTO RICO 
acute and occasionally tipped with two superimposed cells ; lobule 
ovoid, 0.17 mm. long, 0.1 mm. wide, strongly inflated, somewhat 
constricted in outer part thus forming a curved and narrow pas- 
sage-way leading into the water-sac, keel strongly arched, slightly 
roughened in outer part from projecting cells, free margin more or 
less involute, straight or nearly so to apex then passing bya broad 
and shallow sinus to end of keel, apical tooth slightly curved ; 
cells of lobe plane or nearly so, averaging 10 p at edge and 16 x 
12 in the middle and toward the base, walls slightly thickened 
with very indistinct trigones and occasional intermediate thicken- 
ings; ocelli commonly two, placed end to end at the base of the 
lobe, 30 # long and 18 » wide: underleaves distant, broadly ob- 
cordate, 0.5 mm. long, 0.07 mm. wide, narrowed toward base, 
bifid about one fifth with a shallow obtuse sinus and_ broad, 
rounded, diverging lobes, each about four cells broad at the 
base ; rhizoids very scanty, sometimes growing from a rudimen- 
tary disc in the basal region of an underleaf: inflorescence dioicous : 
@ inflorescence on a leading branch, more rarely on a short 
branch, innovating on one side, the innovation commonly simple 
and sterile, rarely floriferous ; bracts suberect, somewhat compli- 
cate, the keel slightly roughened from projecting cells but not 
winged, subequally bifid, the lobe ovate to obovate, 0.4 mm. long, 
0.25 mm. wide, gradually narrowed to the obtuse or rounded 
apex, lobule similar to the lobe but narrower, measuring 0.19 mm. 
in width, margin entire ; bracteole connate with one or both bracts 
at base, oblong, 0.35 mm. long, 0.27 mm. wide, bifid one tenth to 
one third with lunulate to obtuse sinus and rounded, erect or 
slightly diverging lobes, margin entire or nearly so ; perianth 
about half exserted, oblong, 0.65 mm. long, 0.35 mm. wide, nar- 
rowed toward base, truncate above and with a short narrow beak, 
sharply five-keeled except in the basal region, the keels rounded 
above and smooth or slightly roughened along their edges: 3 in- 
florescence and mature sporophyte not seen (/. 20, f. 1-77). 
_ On bark of trees. North slope of the Luquillo Mountains, 
feller (1141, type, 4708a, 4719 p. p., 4721 p. p., 4729, 4731 P- b» 
47314, 47320, 4733, 4734 p. p.). El Yunque, Evans (3,149): 
Originally collected by Szutenis. 
The close relationship which exists between Harpalejeunea ovata 
and Lejeunea stricta has already been commented upon by Spruce* 
and by Stephani.t AH. subacuta is closely allied to both these 
plants and the three together constitute a group of species so very 
oe 
* Hep. Amaz. et And. 170. 1884. 
t Hedwigia, 27: 291. 1888. 
