270 Evans: HEPATICAE OF PUERTO RICO 
writers. Gottsche, for example, in his Mexikanske Levermosser, 
cites specimens from various Mexican localities, but according to 
Stephani several of these are referable to other species. The rela- 
tionship of L. cardiocarpa to L. planifolia is close, the two species 
agreeing in the possession of dry and hyaline cells on the margin 
of the lobe. In L. cardiocarpa, however, these cells are usually re- 
stricted to the apex of the lobe, and it is only in rare instances that 
the apical group is supplemented by a narrow band near the antical 
base. The hyaline cells at the apex usually form but a single row. 
They are more or less elongated and spread out in a digitate man- 
ner, their outer extremities being free from one another and 
rounded. The hyaline cells near the base are the same in structure 
but scarcely project beyond the other marginal cells. Apparently 
hyaline cells of this character play a part in holding the plants 
firmly to the substratum, as already noted by the writer in con- 
nection with the genus Stictolejeunea.* In the structure of the 
lobule, which conforms closely to the Leptocolea type, L. cardio- 
carpa differs markedly from L. planifolia. The long antheridial 
branches are also very distinctive, and the lobes of the perigonial 
bracts usually bear a cluster of hyaline cells at the apex, just as 
in the leaves. In L. planifolia hyaline cells are never found in 
this position. 
Leptocolea Jooriana (Aust.) 
Lejeunea Jooriana Aust. Bull. Torrey Club 6: 20. 1875. 
Lejeunea (Colo-Lejeunea) Jooriana Steph. Bot. Gaz. 17: 171. 1892. 
Cololejeunea Jooriana Evans, Mem. Torrey Club 8: 173. pl. 22, 
f. 9-20. 1902. 
On living leaves. Near Cayey, Evans (71, in small part, 
mixed with L. cardiocarpa and other epiphyllous Lejeuneae). The 
original locality for L. Jooriana is in Louisiana, but it is now 
known also from North Carolina, Florida, the Bahamas, and 
Bermuda. The type specimen grew on reeds but most of the 
material examined grew on bark. The occurrence of the species 
on living leaves in Puerto Rico is not surprising since L. cardio- 
carpa, its nearest ally, also grows on both bark and leaves. 
A full description of LZ. Jooriana, with figures, was recently 
published by the writer, as indicated above. In the present paper, 
* Bull. Torrey Club 34: 3. 1907. 
