Evans: HEpaticar oF PUERTO Rico 17 
truncate to retuse at the apex, margin as in the leaves ; perianth 
almost hidden by bracts, obovoid, 0.7 mm. long, 0.5 mm. wide, 
compressed, beak short but distinct, antical surface plane or nearly 
So, postical surface with two sharp keels more than half as long 
as the perianth, lateral keels and postical keels all extended beyond 
the beak in the form of short, erect, rounded and inflated horns: 
o inflorescence and mature sporophyte not seen (PLATE 2, FIG- 
URES 13-22). 
Onatwig. Puerto Rico, Schwanecke (726), the type locality. 
Not since collected on the island, but reported by Spruce from 
either Dominica or St, Vincent, where it was collected by Llhott. 
When the writer’s paper on the Puerto Rico species of Cerazo- 
‘ejeunea * was published, no reference was made to C. portoricensis 
because it was supposed that this species belonged to Meurolejeunea. 
A study of the type, however, which is preserved in the Hampe 
herbarium, brings out the facts which are noted above. The 
“ status morbidus”’ described by the original authors as having the 
leaves digitate-palmulate at the apex probably represents the 
normal condition of the species, the peculiar appearance being due 
to the presence of hyaline cells. These cells doubtless serve the 
Same purpose as in Vewrolejeunea catenulata, in helping the plants 
cling to the substratum. Hyaline cells of this nature have not 
been described for any other species of Ceratolejeunea. 
The only species with which C portoricensts is likely to be 
confused is Neurolejeunea catenulata. The irregularity in the 
arrangement of the ocelli, the different plan upon which the lobules 
are constructed, the single subfloral innovation, and the four- 
horned perianth will at once serve to distinguish it. In separating 
it from the other Puerto Rico species of Ceratolejeunea, the dif- 
ferent cell-structure, the hyaline cells at the apices of the lobes, 
and the undivided or merely retuse underleaves all yield differen- 
tial characters of importance. The species is also somewhat 
anomalous from the fact that it never develops the utriculi which 
are found in so many members of the genus. 
OMPHALANTHUS 
The artificial character of the genus Omphalanthus, as ori- 
ginally described in the Synopsis Hepaticarum, was clearly demon- 
Fe ne alae emebiinolig de 
* Bull. Torrey Club 32: 273-290. pl. 19, 20. 1905. 
