Evans: HEeEpaTICAE OF Puerto Rico 201 
underleaves and in the fact that the latter are normally undivided. 
In the floral organs the differences are not very marked, but the 
broader perichaetial bracts of C. Chitonia and the shortly bifid 
bracteole may be alluded to in this connection. 
Cyclolejeunea accedens (Gottsche) 
Lyjunea accedens Gottsche ; G. L. & N. Syn. Hep. 339. 1845. 
Leeunea (Privno-Lejunea) leptocardia Spruce, Hep. Amaz. et 
And. 159. 1884. 
Lejeunea (Odontolejeunea) accedens Steph. Hedwigia, 27: 281. 
pl. 14, f. 34-38. 1888 
Pale green, growing in thin loose mats, often in company 
with other hepatics: stems o.1 mm. in diameter, sparingly and 
irregularly branched, the branches widely spreading, usually 
with smaller leaves than the stem: leaves imbricated, the lobe 
widely spreading, plane or nearly so, falcate-ovate, I.4 mm. 
long and 1.1 mm. wide on the main stem, attached by an almost 
longitudinal line of insertion but decurrent at the antical base 
y a single cell, antical margin nearly straight near base, then 
strongly curved to apex, postical margin straight or slightly in- 
curved, usually forming a continuous line with keel, apex broad 
and rounded on stem-leaves, varying to obtuse or subacute on 
small branches, margin sometimes entire or subcrenulate but usu- 
ally sharply crenulate or denticulate from projecting cells; lobule 
ovoid, 0.3 mm. long, 0.2 mm. wide, strongly inflated, keel more 
or less arched, roughened from projecting cells, free margin 
Strongly involute to beyond apex, sinus short and lunulate, apical 
tooth blunt and slightly curved ; cells of lobe convex except in 
basal region, averaging 244 at the margin, 35 / in the middle and 
45 X 35 at the base, each cell bearing a blunt median wart, rep- 
resenting a local thickening of the outer wall, walls otherwise thin, 
trigones and intermediate thickenings wanting or minute and in- 
distinct ; ocelli none: underleaves broadly orbicular, 0.28 mm. 
3 
mm. wide, obtuse or subacute, margin denticulate, lobule oblong, 
0.17 mm. long, 0.07 mm. wide, usually blunt, sometimes poorly 
