216 Evans: THE HEPATICAE OF THE BAHAMA ISLANDS 
and very obtuse or, more commonly, abruptly apiculate, margin 
minutely crenulate from projecting cells and sometimes vaguely 
angular-sinuate or angular-dentate in outer part; lobule inflated 
throughout, ovate, 0.12 mm. long, 0.08 mm. wide, keel more or 
less arched, slightly roughened from convex cells, free margin 
straight or a little curved, involute to or beyond the apex, the 
latter (not clearly seen without dissection) consisting of a single 
straight and slightly projecting cell bearing a hyaline papilla at 
its proximal base, sinus shallow, two or three cells long; cells of 
lobe slightly convex on both free surfaces, averaging 16 w at the 
margin and 32 X 18y in median and basal regions, thin-walled 
but with distinct triangular trigones and occasional elliptical 
intermediate thickenings: underleaves distant to contiguous, 
plane, orbicular to broadly orbicular, measuring 0.30.35 mm. 
on robust axes but often much smaller, cuneate at the base on 
slender branches but typically rounded to cordate, bifid one third 
to one half with erect triangular divisions, mostly acute at the 
apex and tipped with a single cell, rarely rounded, obtuse or apicu- 
late, sinus acute, margin entire or slightly crenulate, rarely vaguely 
sinuate; inflorescence autoicous: @ inflorescence sometimes borne 
on a leading branch, sometimes on a more or less abbreviated 
branch (the latter in extreme cases bearing only one leaf in addition 
to the bracts), innovating on one side, rarely on both, the innova- 
tion sometimes simple but usually branched and often again florif- 
erous; bracts obliquely spreading, more or less complicate with 
a blunt keel, lobe narrower than in the leaves, oblong to oblong- 
lanceolate, 0.6 mm. long, 0.25 mm. wide, narrowed to the acute 
or obtuse apex, margin slightly crenulate and irregularly sinuate 
or sinuate-dentate, lobule very variable, averaging about 0.15 X 
0.08 mm., usually ligulate in outline, the apex blunt or sharp 
and the margin entire or nearly so; bracteole broadly oblong to 
oblong-quadrate, averaging about 0.5 X0.35 mm., bifid about one 
third with erect or connivent acute divisions and a very narrow 
the apex with rounded angles, terete below, bluntly five-keeled 
in apical region, beak none, surface more or less roughened from 
convex cells especially along the keels: # inflorescence occupying 
a short branch, not proliferating; bracts in two to six pairs, im- 
bricated, delicate in texture (the cells without local thickenings), 
shortly and subequally bifid with a strongly arched keel and obtuse 
to subacute divisions; bracteoles restricted to base of inflorescence, 
minute, orbicular, similar to the underleaves: antheridia borne 
