382 Evans: HeEpaTICAE OF PUERTO RICO 
noted here that D. hamatifolia also produces propagula which are | 
specialized to only a slight extent; the first underleaf for example _ 
although considerably larger than the succeeding one shows only 
a trace of a disc. ; 
Drepanolejeunea bispinulosa sp. nov. 
Pale green, scattered among other hepatics: stems 0.035 mm. 
in diameter, prostrate, sparingly and irregularly pinnate, the 
branches widely spreading: leaves distant to subimbricated, the 
lobe obliquely spreading in lower part, widely spreading above, 
convex near base, plane or slightly concave beyond lobule, falcate-— 
lanceolate, 0.35 mm. long, 0.1 mm. wide, slightly narrowed toward 
base and attached by an almost longitudinal line of insertion, — 
margin distinctly crenulate or denticulate from projecting cells | 
except near the base, the tooth near end of keel and the opposite _ 
tooth on antical margin larger than the others and spiniform, usu-_ 
ally two or three cells long and one or two cells wide at the base, — 
rarely obsolete, apex long-acuminate, ending in a row of three of 
four cells; lobule strongly inflated throughout, ovate, 0.15 mm. 
long, 0.1 mm. wide, keel strongly arched, distinctly roughened im 
the outer part from projecting cells, free margin involute to or be- 
yond the apex, then passing by a lunulate sinus to end of keel, 
apical tooth strongly curved; cells of lobe slightly convex, the 
projecting wall slightly thickened, lateral walls variable, sometimes 
slightly and uniformly thickened, sometimes with small trigones, 
averaging 17 x 12; ocelli indistinct, usually one in the middle 
of the lobe, sometimes obsolete: underleaves distant, similar t? 
those of D. didens : remaining parts unknown (f/. 4, f. 7-7). 
On rotten wood. Luquillo Mountains, Heller (4743 p.p.). 
Drepanolejeunea bispinulosa is very closely related to D. bidens, 
so closely in fact that it may be questioned whether it is really 
distinct or whether it represents a robust condition of that species: 
It differs from D. didens in the more distinctly crenulate or denticu-_ 
late margins of its lobes and especially in their two spiniform teeth. 
These slight differences give the plants an entirely different ap” 
pearance from those of D. didens, and so far no connecting links 
have been observed. Unfortunately the plants are entirely with- 
out sexual organs and do not even show propagula. 3 
Almost equally close to D. dispinulosa is the Andine Lejeune® 
(Drepano-Lej.) lichenicola Spruce.* The two species are of about 
= 
* Hep. Amaz. et And. 191. 1884. 
