20 Evans: HEpaTICAE OF PUERTO Rico 
cality, Schwanecke. Luquillo Mountains, Sintents (36). El Yun- 
que, Evans (12, 54, 56): The species is most at home at low 
elevations on the mountains and, according to Spruce, scarcely 
ascends to 2000 m. It has been recorded from the following 
West Indian Islands: Jamaica, the type locality, St. Kitts, Guad- 
~ eloupe, Dominica, and Martinique. On the mainland its range 
extends from Mexico to Bolivia, and it has also been reported 
from the Galapagos Islands. Whether the species occurs outside 
the American tropics is doubtful. Many years ago it was reported 
from the East Indies by Montagne,* and has since been listed 
from Madagascar by Gottsche.t The East Indian record, how- 
ever, does not seem to have been confirmed, and according to 
Spruce t the specimens from Madagascar, so far as he had seen 
them, ought to have been referred: to Lejeunea (Euosmolejeunea ?) 
Montagnei Gottsche.§ 
The genus Omphalanthus occupies a somewhat isolated posi- 
tion among the Lejewneae of Puerto Rico. The loosely cespitose 
habit of its single species, the long and sparingly branched stems, 
the pale color and the terete perianth (ricuRE 1) will at once dis- 
tinguish it from other genera with undivided underleaves. The 
structure of the lobule is less definite than is usual in the Leyewneae 
The apex is blunt and the hyaline papilla, although retaining its 
marginal position, is displaced into the sinus (FIGURE 6). The 
nearest relative of the genus, as Spruce has pointed out, is Pedtole- 
jeunea, which has no known representatives in the West Indies. 
This genus agrees with Omphalanthus in color and general habit 
and in the structure of the lobule. The leaves, however, are more 
narrowed toward the apex and are often distinctly pointed, the 
leaf-cells have much smaller trigones, the underleaves are long- 
decurrent,_and the perianth is distinctly five-keeled. Peltolejeunea 
is a tropical genus of which about eight species are at present 
known. Most of these occur in the mountains of South America ; 
the others have been recorded from Africa or from the islands of 
the Pacific. 
Omphalanthus filiformis is fully described by Spruce, and the 
*G. L. & N, Syn. Hep. 305. 1845. eo a 
+ Abh. Bremen Naturw. Ver. 7: 352. 1882. 
t Pearson, Christiania Vidensk.-Selsk. Forh. 18928: 4. 
% Ann. Sc. Nat. IT. Bot, 19: 261. p/. 9. f 3. 1843. 
er ern eR ER a Lr PS 
