266 Evans: HEPATICAE OF PUERTO RICO 
wide, apical tooth broad, rounded or retuse at the apex, three to 
five cells long and three to five cells wide at the base, tipped by two 
or three cells side by side and bearing a marginal hyaline papilla 
at their junction, sinus straight or nearly so, free margin more or 
less involute near base, bearing an acute tooth about midway 
‘between base and apex; cells of lobe plane, averaging 16u along 
the postical margin, 27 X 184 in the middle, and 45 X 18m at 
the base, thin-walled but with minute triangular trigones and 
occasionally with minute circular intermediate thickenings, hyaline 
marginal cells thin-walled throughout, a little larger than the 
adjacent green cells: inflorescence autoicous: 2 inflorescence 
‘sometimes borne on a leading branch, sometimes on a very short 
branch, innovating on one side, the innovation usually soon florifer- 
ous and often repeatedly so; bracts obliquely to widely spreading, 
the inner one bifid almost to the base, complicate, the lobe as in 
the leaves but scarcely if at all falcate, 0.75-1 mm. long, 0.45-0.6 
mm. wide, lobule ovate, plane, 0.35 X 0.2mm. broad and more or 
less retuse at the apex, margin otherwise entire or vaguely and ir- 
regularly sinuate, the proximal marginal tooth rarely apparent; 
perianth about one third exserted, obovate, 0.75 mm. long, 0.55 
mm. wide, broad and retuse at the apex and bearing a short but 
distinct beak, antical surface plane, postical keel rounded or some- 
times two-angled in the upper part, surface smooth or very slightly 
roughened from projecting cells: o& inflorescence occupying a 
short branch, not proliferating; bracts mostly in from two to four 
pairs, loosely imbricated, diandrous, without hyaline cells, the lobe 
rounded and usually revolute at the apex, lobule rotund, rounded 
at the apex and usually involute along the free margin: capsule 
0.25 mm. in diameter; spores (not quite mature) 16u in short 
diameter, minutely verruculose. (PLATE II, FIGURES 8-16.) 
On leaves of trees. Utuado, Howe (862, in part), E. G. Britton 
& D. W. Marble (882, in part). No. 882 may be designated the 
type. 
The plant just described is very closely related to L. marginata, 
a species to which reference has already been made. The original 
Jungermannia marginata was described from sterile specimens 
collected on the island of Mauritius and sent to Lehmann by Presl. 
A few years later Montagne, under the name Lejeunea hyalino- 
marginata Nees,* listed another plant from Mauritius but gave 
no diagnosis, so that this name must be regarded as a nomen 
nudum. In the Synopsis Hepaticarum L. hyalino-marginata is 
* Ann. Sci. Nat. Bot. II. 14: 335. 1840. 
1S ame aa 
