Evans: HeEpaTICAE OF PUERTO RICo ll 
the margin and 18 x 13 yin median and basal portions, walls uni- 
formly thickened, middle lamella sometimes distinct ; ocelli averag- 
ing 23 x 144, usually in a continuous straight row from eight to 
twelve cells long, extending from the base to about the middle of 
the lobe, subparallel with the keel and about one-fourth the dis- 
tance from the postical margin to the antical ; hyaline cells (when 
present) occupying the broad apex of the lobe and forming a group 
from one to three cells wide, the marginal ones free and rounded 
at their tips, sometimes attaining a length of 20: underleaves 
contiguous to slightly imbricated, broadly orbicular, 0.4 mm. long, 
0.45 mm. wide, abruptly narrowed at the base, sometimes minutely 
auriculate or indistinctly short-decurrent on one side, apex broad, 
rounded to slightly retuse, margin entire: inflorescence dioicous : 
© inflorescence borne on a more or less elongated branch, inno- 
vating on both sides (rarely on only one side), the innovations 
obliquely spreading, usually simple and sterile; bracts obliquely 
spreading, the lobe falcate, oval to obovate, 0.85 mm. long, 0.4 
mm. wide, rounded at the scarious apex, margin entire, ocelli less 
distinct than in the leaves, often irregularly scattered in the basal 
region or forming an interrupted row, keel sharp, very narrowly 
winged, lobule ovate, 0.35 mm. long, 0.17 mm. wide, rounded at 
the apex ; bracteole orbicular-obovate, 0.55 mm. long, 0.5 mm 
wide, gradually narrowed toward the base, rounded to retuse at 
the broad apex, margin entire ; perianth about half-exserted, obo- 
vate in outline, 0.85—1.2 mm. long, 0.6-0.85 mm. wide, narrowed 
toward the base, compressed, antical face plane or with a short 
and low median fold, lateral keels sharp and occasionally indis- 
tinctly and interruptedly winged, rounded at the upper angles or 
dilated into flat horns, the apex of the perianth thus varying from 
truncate to deeply emarginate, beak short but distinct, postical 
keel sharply two-angled or rounded, sometimes dilated in the 
upper part in the form of a rounded swelling extending beyond 
the beak: J inflorescence terminal on a more or less elongated 
branch ; bracts in from three to five pairs, imbricated, strongly in- 
flated, shortly and subequally bifid, keel strongly arched, lobes 
rounded and scarious at the apex ; bracteoles similar to the under- 
leaves but smaller: antheridia and mature sporophyte not seen 
(PLATE 2, FIGURES I-12). 
On bark of trees and on logs. El Yunque, Zvans (779, 143, 
144). Also collected recently in Jamaica, Evans. The type lo- 
cality of Lejeunea catenulata is given in the Synopsis as follows: 
“Th Lymenophyllo ciliato et Neckera abietina Hook. Americae 
septentrionalis (Hb. Sieber., Flotov., N.).’”’ On account of the 
indefinite nature of this record further information regarding the 
