Evans: HEpaTICAE oF PuERTO RICO 16 
islands: St. Kitts, Breutel, the type locality ; Guadeloupe, Z’ Her- 
minier, Marie, Duss; Dominica, Elliott; Martinique, Bélanger: 
Recently collected by the writer in Jamaica. 
NV. Lreutelu is very closely related to N. seminervis (Spruce) 
Schiffn., the type of the genus, which is known at present only 
from northern Brazil. The two species agree in general appear- 
‘ance, in size, in color, and in the form and structure of the leaves, 
underleaves and floral organs. In J. seminervis, however, the 
underleaves are plane and there is a false nerve in the lobes, con- 
sisting of a row of ten or more ocelli. Since these differences, 
although so slight, are apparently constant the two species should 
undoubtedly be kept apart. The relationship which they bear to 
each other is in fact the same as that which exists between Cera- 
tolejeunea valida and C. brevinervis. From UN. catenulata the pres- 
ent species may at once be distinguished by its convex leaf-lobes 
and by its entire lack of both ocelli and hyaline cells. 
The most important characters separating Weurolejeunea from 
Ceratolejeunea are apparently those derived from the leaf-cells, the 
lobules, and the perianths. In Newrolejeunea the walls of the cells 
are more or less uniformly thickened, the trigones being indis- 
tinct; in Ceratoleyeunea the trigones are large and conspicuous. 
In Neurolejeunea the lobule is tipped with a tooth two or more 
cells in length, and the hyaline papilla is borne in the sinus and 
slightly displaced from the margin; in Ceratolejeunea the lobule is 
tipped with a single cell, and the marginal papilla is borne at its 
proximal base. In Neurolejeunea the lateral horns of the perianth 
are flat, and the postical keel (when produced at all) forms a single 
Swelling ; in Ceratolejeunea there are four distinct horns, all more 
or less inflated. Lejeunea portoricensis agrees with Neurolejeunea 
in its leaf-cells (FIGURE 15), but with Ceratolejennea in its lobules 
(FIGURE 18) and perianths (FIGURE 13). It is, therefore, referred 
to this latter genus. 
Ceratolejeunea portoricensis (Hampe & Gottsche) 
Lejeunea portoricensis Hampe & Gottsche, Linnaea 25: 352. 1852. 
Lejeunea (Neuroleyeunea) portoricensis Steph. Hedwigia 27: 288. 
1888, 
Neurolejeunea portoricensis Schiffn. in Engler & Prantl, Nat. Pflan- 
zenfam, 1°: 131. 1895. 
