os Evans: HEpaTICAE OF PUERTO RICO 
On trees. Between Cayey and Caguas, Howe (1413 P. p.). 
growing mixed with ZL. Sagraeana and Euosmolejeunea trifaria. 
These specimens may be considered the type. A single plant of 
the species without perianths but with male and female flowers 
occurs mixed with the type specimen of Levewnea Marie from the 
island of Guadeloupe. It has also been collected by the writer 
in. Jamaica and may therefore be expected from other localities in 
the West Indies. 
This interesting species is named in honor of Dr. Marshall A. 
Howe, of the New York Botanical Garden, who first collected 
specimens with perianths (March, 1906). It differs from all other 
known species of Lopholejeunea in the possession of a bifid bracteole, 
but in other respects is a typical member of the genus. Among 
American species it is further aberrant because it bears teeth along 
the margin of the bracteole, but this second peculiarity has been 
described for at least three paleotropic species ; namely, LZ. culopha, 
of the Pacific Islands, L. dentistipula Schiffn., of Amboina, and ZL. 
Jimbriata (Gottsche) Schiffn., of Madagascar, Australia and New 
Guinea. In these three species, however, the bracteole is broad 
and rounded at the apex. 
L. Howei is about as robust as ZL. Sagraeana but differs not 
only from this species but also from Z. Muelleriana in its color, 
which is olive-green rather than brown or black. It is also desti- 
tute of glossiness. In the characters derived from leaves, under- 
leaves and cell-structure it agrees closely with Z. Muelleriana, the 
lobes of the subfloral leaves showing an even stronger tendency to 
be sharp-pointed. More striking differences are to be found in the 
bracts and perianths, the lobules of the bracts being larger and 
more conspicuous and the wings of the perianth bearing fewer and 
smaller teeth. In old perianths these teeth show a tendency to 
break off, so that the keels appear either entire or irregularly den- 
ticulate. The differential characters derived from the bracteoles, 
which are perhaps the most important of all, have already been — 
emphasized. 
YALE UNIVERsITY. . 
Explanation of plates 3-4 
As in the previous papers of this series the figures were drawn by the writer and 
prepared for publication by Miss Hyatt. 
