Evans: HEpATICAE OF PUERTO Rico 27 
convex walls and more conspicuous trigones, in its firmer under- 
leaves with thicker cell-walls and in its less sharply pointed bracts 
with blunt lobules. Propagula have not as yet been observed in 
either species. 
The type-specimens of D. crassiretis grow mixed with D. diocel- 
/ata and the two species have certain characters in common, such as 
the thickened cell-walls and the blunt leaf-lobes. There is, how- 
ever, little difficulty in distinguishing them, on account of the ocel- 
late and usually spreading lobes of D. diocellata, the less con- 
spicuous local thickenings in its cells, the more strongly curved 
apical teeth of its lobules, its narrower perichaetial bracts and 
narrower and more deeply bifid bracteoles. 
DREPANOLEJEUNEA ARAUCARIAE Steph. 
Drepanolejeunea Araucartae Steph. Hedwigia, 35: 80. 1896. 
Bright green varying to brownish green, growing in thin 
irregular patches often in company with other Lejeuneae: stems 
0.025 mm. in diameter, prostrate, sparingly and irregularly pinnate, 
the branches widely spreading : leaves distant, the lobe obliquely 
spreading in the lower part, widely spreading above, plane or 
slightly concave, falcate-lanceolate, 0.25 mm. long, 0.09 mm. 
wide, scarcely narrowed at the base and attached by an almost 
longitudinal line of insertion, margin denticulate, the teeth about 
three on each side, projecting away from the substratum, each 
tooth usually a projection from a single cell, the tooth near keel 
often larger than the others and composed of from one to three 
cells, apex attenuate ending in two or three cells in a row; lobule 
strongly inflated, broadly ovate, 0.1 mm. long, 0.07 mm. wide, 
keel strongly arched, distinctly roughened in outer part from pro- 
jecting cells, free margin slightly curved, plane and appressed to 
lobe, passing beyond apex by a lunulate sinus to end of keel, 
apical tooth more or less curved ; cells of lobe plane or nearly so, 
averaging 14 x 9p, thin-walled; ocelli commonly two, one at the 
very base of the lobe measuring 18 x 14 yp, the other close to the 
apex of the lobule: underleaves distant, basal portion subquad- 
rate, 0.03 mm. long, marginal cells six, divisions obliquely to 
widely spreading (up to 0.08 mm.), each consisting of two or three 
cells in a row: inflorescence dioicous: @ inflorescence usually 
on a short branch, more rarely on an elongated branch, innovating 
on one side with a simple and sterile innovation; bracts erect- 
spreading, more or less complicate, unequally bifid, the lobe ovate 
to ovate-lanceolate, attenuate, coarsely and irregularly laciniate 
