Evans: THE HEPATICAE OF THE BAHAMA ISLANDS 209 
On bark.. New Providence: Soldiers Road, E. G. Britton (824 
p.p.); Grantstown, E. G. Britton (565 p.p.). Cuba; Porto Rico; 
Florida. 
12. Rectolejeunea Brittoniae sp. nov. 
Yellowish green, becoming brownish with age, growing in 
depressed mats: stems about 0.08 mm. in diameter, sparingly and 
irregularly branched, the branches widely spreading, not micro- 
phyllous; rhizoids sparingly produced: leaves imbricated, the lobe 
plane or slightly convex (when moist), scarcely or not at all fal- 
cate, obliquely to widely spreading, broadly ovate to orbicular, 
averaging about 0.5 X0.45 mm., arching partially or wholly across 
axis, antical margin outwardly. curved from the base to the broad 
and rounded or very obtuse apex, postical margin slightly curved 
or almost straight, forming an almost continuous line with the 
keel or with a shallow indentation at the junction, margin slightly 
and irregularly crenulate from projecting cells, sometimes vaguely 
sinuate; lobule inflated throughout, triangular-ovate, about. 0.1 
mm. long and of the same width at the base, keel straight or very 
slightly arched, free margin curved and involute to or beyond the 
apex, apical tooth straight and slightly projecting, hyaline papilla 
in a distinct depression, sinus straight or nearly so, very short 
(twoor three cells long) ; cells of lobe a little convex, averaging about 
17m at the margin, 25u in the middle, and 30X25, at the base, 
walls with indistinct triangular trigones and rarely with oval inter- 
mediate thickenings; ocelli none: underleaves distant to contig- 
borne ona short branch but usually on a leading branch, innovating 
on one side, rarely on both, the innovations often soon floriferous 
but sometimes sterile; bracts widely spreading, complicate, une- 
qually bifid, keel sharp, sometimes very narrowly winged, lobe 
ovate to obovate, sometimes slightly falcate, maximum size about 
0.6 X0.4 mm., apex and margin as in the leaves, lobule narrowly 
ovate to ligulate, about 0.45 X0.15 mm., the apex more or less 
pointed or bidentate; bracteole oblong, 0.5 mm. long, 0.4 mm 
wide, tapering somewhat toward base and apex, bifid about one 
fourth with acute lobes and sinus, margin as in the underleaves; 
perianth about one third exserted, oblong to obovate, about 0.65 
mm. long and 0.45 mm. wide, rounded to truncate at the apex with 
a short but distinct beak sometimes borne in a slight depression, 
slightly compressed in the upper part, antical surface plane or with 
