276 Evans: HEPATICAE OF PuERTO RICO 
for about half its length beyond the lobule and is built up of 
many more cells, the projecting portion being about eight cells 
long and six cells wide. The perichaetial bracts, also, are smaller 
and their lobules are greatly reduced. Neither perianths nor male 
“inflorescences are present in the specimens. It is to be hoped 
that this species may be again collected so that its characteristics 
and relationships may become better known. 
Aphanolejeunea crenata sp. nov. 
Pale green, growing in small mats among other Lejeuneae: 
stems straight or nearly so, 0.025 mm. in diameter, sparingly 
and irregularly branched, the branches widely spreading: leaves 
distant to contiguous, the lobe obliquely spreading, oblong, plane 
or slightly concave, 0.25 mm. long, 0.07 mm. wide, not falcate, 
apex obtuse or subacute, tipped with a single rounded cell, antical 
margin spreading from the base, slightly curved, postical margin 
beyond the keel straight to slightly curved, margin crenulate 
from projecting cells; lobule ovate, 0.12 mm. long, 0.07 mm. wide, 
inflated throughout, free margin involute to apex, apical tooth 
blunt and slightly curved, proximal tooth rounded, indistinct, 
each tooth consisting of a single cell, sinus lunulate, about three 
cells long, hyaline papilla in sinus but displaced one cell from the 
margin, keel arched, roughened from projecting cells; cells of lobe 
averaging about 23 X 16u near the base, and about 16u in other 
parts, more or less convex, thin-walled throughout: inflorescence 
paroicous (or synoicous): @ inflorescence borne on a more or less 
elongated branch, innovating on one side, the innovation (so far 
as observed) simple and sterile; bracts erect-spreading to ob- 
liquely spreading, complicate, unequally bifid, the lobe as in 
the leaves, lobule ligulate, about 0.15 mm. long and 0.06 mm. wide, 
blunt at the apex, margin crenulate in upper part from projecting 
cells; perianth obovate, 0.35 mm. long, 0.18 mm. wide, inflate 
above and with faint indications of five keels, each keel being 
represented by a small group of projecting cells, subtruncate at 
the apex and with a short beak, surface (except for the rudimentary 
keels) usually smooth, rarely slightly roughened from scattered pro- 
jecting cells: antheridia borne singly, usually one in the axil of 
the leaf below a subfloral innovation and another in the axil of 
the opposite perichaetial bract; leaves bearing the antheridia much 
like ordinary leaves: capsule (not quite mature) 0.08 mm. in 
diameter; elaters from an old capsule 5 wide. (PLATE 12, 
FIGURES I 1-16.) 
On living leaves. El Yunque, Evans (36, in small part, in 
company with Drepanolejeunea Araucariae, etc.). 
Be: VR cae 
