Evans: HEpaATICAE OF Puerto RIco 203 
which it resembles in size and color and in the nature of its gemmae, 
it may at once be distinguished by its exocellate leaves, by its reg- 
ularly bifid underleaves, by its autoicous inflorescence and by its 
winged perianth. Most of these characters will also separate it 
from the much more robust C. Chitonia. 
Cyclolejeunea angulistipa (Steph.) 
Leeunea angulistipa Steph. Hedwigia, 29: 69. 1890. 
Prionolejeunea angulistipa Steph. 2. c. 35: 118. 1896. 
Pale yellowish or whitish green, becoming brownish upon dry- 
ing, loosely tufted : stems 0.09 mm. in diameter, less closely ad- 
herent to the substratum than in the other members of the genus, 
sparingly and irregularly branched, the branches widely spread- 
ing: leaves loosely imbricated, the lobe abruptly dilated from a 
Narrow base, widely spreading (in outer part), broadly falcate-ovate, 
0.5 mm. long, 0.45 mm. wide, attached by an almost longitudinal 
line of insertion, but decurrent at the antical base by a single cell, 
antical margin straight or slightly incurved near base, then strongly 
outwardly curved to apex, postical margin straight or somewhat 
outwardly curved, forming an angle of go° or more with keel, 
apex broad, rounded to obtuse, margin minutely and regularly 
crenulate or denticulate from projecting cells, except close to the 
antical base ; lobule ovoid, 0.17 mm. long, 0.1 mm. wide, much 
inflated, keel strongly arched, more or less roughened from pro- 
jecting cells, free margin strongly involute to apex, sinus broad and 
lunulate, apical tooth curved and rather sharp; cells of lobe slightly 
convex, averaging 16 4 at the margin, 25 in the middle and 32 
X 25 # at the base, rather thick-walled, the triangular trigones and 
the occasional intermediate thickenings large and conspicuous ; 
ocelli when present one to four in number, measuring 50 x 35 /, 
Situated near the base of the lobe, but separated from the line of 
insertion by one or two rows of cells: underleaves distant, orbicular 
or rhombic-orbicular, 0.14 mm. long, bifid about one half (to within 
two or three cells of the radicelliferous region) with triangular, 
acute and erect lobes separated by an acute to obtuse sinus, margin 
entire or subcrenulate, often angular-dentate on the sides : inflores- 
cence dioicous: © inflorescence borne on a leading branch, more 
farely on a short branch, innovating on one side, the innovation 
commonly branched and sometimes floriferous ; bracts obliquely 
Spreading, the lobe obovate, unsymmetrical, 0.45 mm. long,o.3 mm. 
wide, rounded at the apex, entire or subcrenulate, lobule oblong to 
lanceolate, 0.2 mm. long, 0.08 mm. wide, margin as in lobe ; 
bracteole free, obovate from a narrow base, 0.45 mm. long, 0.3 
