Near 
Evans: HEPATICAE OF PuERtTO Rico 25 
ovate in outline, 0.25 mm. long, 0.2 mm, wide, the inflated portion 
conspicuous, occupying the inner half of the lobule and forming 
a hemispherical swelling often extending beyond the free margin, 
apical tooth rounded and often indistinct, sinus broad and shallow, 
adnate portion from one to three cells long; lobule sometimes 
poorly developed ; cells of lobe plane or slightly convex, averag- 
ing 10m at the margin, 20 in the middle and 30 X 204 at the 
base, middle lamella often distinct, trigones large, triradiate with 
rounded to pointed ends, intermediate thickenings occasional, cir- 
cular to oval in outline, pits small and narrow, often obliterated by 
the confluence of the local thickenings, free walls of cells uniformly 
thickened: underleaves contiguous to imbricated, plane or with a 
slight median bulging, reniform, 0.35 mm. long, 0.5 mm. wide, 
rounded to subcordate at the base, apex broad and rounded, margin 
entire: inflorescence normally autoicous: Q branch variable in 
length but rarely much abbreviated ; bracts widely spreading, the 
lobe falcate, suborbicular or broadly ovate-orbicular, 0.95 mm. 
Idng, 0.85 mm. wide, antical margin strongly arched (except near 
and irregular scattered teeth, the largest three or four cells long, 
broad at the base and blunt or sharp at the apex, lobule appressed 
to the lobe or explanate, very minute, reduced to a mere tooth at 
the base of the lobe, 0.15 mm. or less in length ; bracteole free, 
broadly 
ing, Margin plane or nearly so, entire or vaguely and irregularly 
Sinuate ; perianth extending but little beyond the bracts, oval to 
obovate in outline, 0.75 mm. long, 0.55 mm. wide without the 
laciniae (0.95 x 0.95 mm. including the laciniae), beak short, ant- 
ical face plane or nearly so, wings of keels deeply laciniate, the 
laciniae cro 
ase, acute 
dentate, often attaining a size of 0.2 x 0.07 mm.: do! spike occupy- 
On the b 
ark of trees and on rotten logs. Near Cayey, Evans 
(85), Betw 
fen Cayey and Caguas, Howe (1412, 1413 p. p.). 
ayaguez, Mrs. Britton & Miss Marble (629 p. p.). Type 
locality, 
tributed in the American tropics: it is already known from eight 
® 
Cuba, Ramon de la Sagra. The species is widely dis- . 
