ee ee oe eS eee ee ee ee ee 
The broad | 
Evans: HEPATICAE OF PuERTO Rico 21 
account of the antheridial spike, as given above, is adapted from 
his description. The species, however, in spite of its distinctness, 
has never been figured, and attention is therefore called to it 
again. Spruce was the first to reduce O. geminiflorus toa syn- 
onym of O. fliformis. In this he has been followed by later 
writers, including both Stephani and Schiffner, although the latter 
retains geminifiorus as the name of a variety. In the writer's 
experience the species occurs in numerous forms but these are too 
inconstant to be designated by formal names. 
LOPHOLEJEUNEA 
Lopholeeunea is one of the largest and most widely distributed 
genera of the Lejenneae Holostipae, including between 30 and 40 
recognized species. Most of these are confined to tropical regions, 
but the genus has also been reported from southern Florida, 
Chile, Japan and New Zealand. Of the species so far described, 
only six are at present known from America, one of these being 
the endemic Z. Anderssonii Steph., of the Galapagos Islands. 
About a dozen species have been recorded from Asia and the 
East Indies and nearly as many from various islands of the 
Pacific. The remaining species are African. The genus is most 
at home at comparatively low altitudes. The majority of the 
species grow on the bark of trees or shrubs or on rotten logs, a 
few are occasionally found on rocks, and at least one species has 
been collected on living leaves. 
In some cases the plants form pure depressed mats of con- 
siderable extent, but it is more usual to find them mixed with other 
Lejeuneae. The stems are prostrate, and the leaves remain closely 
appressed to the substratum even when dry. In sunny places, 
where the plants attain their best development, the walls of the 
cells are usually so deeply pigmented that they give a dark-brown 
or black color to the whole tuft ; in shady localities the pigmenta- 
tion tends to be less pronounced and the plants appear olive-green, 
_ &F even bright-green, the color of the chloroplasts showing through 
He walls. A glossiness in the leaves is also frequently apparent. 
obes spread widely from the axis and are more or less 
Founded at the antical base (PLATE 3, FIGURES 10, 12). They are 
usually plane or only slightly convex, but the apex, which is some- 
