Evans: HEpaATICAE OF PUERTO RICO 557 
of the perianth are irregularly dentate, but the postical keel, which 
is rather indistinct, is destitute of teeth. On the whole the den- 
tation of both bracts and perianths is so indefinite that it can hardly 
be considered a valid specific character, more especially since sim- 
ilar teeth are occasionally found in L. Crescentiae. In C. Let- 
boldii the bracts and perianths are usually entire but often show 
indications of marginal teeth. The forms of C. Lehmazxniana, 
which grow on living leaves and which have heretofore been re- 
ferred to L. Crescentiae, show a marked development of the pros- 
trate portions of the plant and thus acquire a somewhat peculiar 
appearance. This, however, is not supported by any structural 
characters which would justify us in attempting to separate these 
leaf-forms specifically, and Stephani did not hesitate to refer to Z. 
Crescentiae, as a synonym, the L. harpaphylla of Spruce, which 
stew on bark. According to Schiffner P. Haenkeana is found on 
both leaves and bark. 
The writer has as yet been unable to compare C. Lehmanniana 
with other members of the genus and therefore makes no attempt 
to discuss the generic characters in detail. Perhaps the genus is 
best characterized by its trigonous perianth and lack of subfloral 
innovations. The latter character and the fact that the lateral 
keels of the perianth are sometimes toothed indicates a relationship 
to the venus Lopholejeunea, but in this genus the plants are deeply 
Pigmented, the lobule is differently constructed, and the postical 
keel of the perianth is sharply two-angled. The trigonous peri- 
anth in Caudalejcunea allies it with Mastigolejeunea and Thysanan- 
thus, but in both of these genera subfloral innovations are a con- 
stant feature. It is an interesting fact that one of the most important 
differential characters separating these genera breaks down in Cau- 
dalejeunea, both entire and toothed leaves being sometimes present 
nN a single individual. 
BRYOPTERIS 
The genus Bryopteris is so distinct that it has had a rather 
"neventful history. Two of its best known species, B. filicina and 
B. diffusa, were originally collected by Swartz in the West Indies 
and were described by him under. /ungermannia in } 788. About 
thirty years later J. filicina was figured and redescribed by 
