pas Evans: HEPpATICAE OF PUERTO RICO 
times rounded and sometimes narrowed to a point, is often dis- 
tinctly revolute. In nearly every species the margin of a normal 
leaf is entire but it tends to be toothed in the vicinity of a female 
inflorescence. The cells of the lobe resemble those described for 
Ceratolejeunea,* although the middle lamella is rarely distinct and 
the local thickenings of the wall are usually less conspicuous. 
Ocelli and hyaline cells are apparently never differentiated. 
The lobule when well-developed consists of two subequal and 
fairly distinct portions, one inflated and the other plane and more 
or less appressed to the lobe (FIGURE 10). The inflated portion, 
or water-sac, is in the basal part of the lobule, extending for a 
variable distance along the keel, and is sometimes so strongly 
swollen that it bulges beyond the free margin. The plane portion 
occupies the outer part of the lobule and extends from the sac to 
the free margin. The latter is slightly separated from the lobe in 
the outer part of the sinus, thus leaving a narrow opening into the 
sac. In many cases the apical tooth cannot be clearly seen with- 
out dissection, not only because it is small and inconspicuous but 
also because it is bent inward toward the lobe. The tooth consists 
of a blunt projection usually composed of a single cell (F1GURE 16). 
The hyaline papilla arises either from the tooth itself or from a cell 
near it on the proximal side; in either case it is slightly displaced 
from the margin and is to be looked for on the surface of the lobule — , 
which is turned toward the lobe. If the sinus is traced to 
its outer extremity it is sometimes found to pass directly into the 
postical margin of the lobe and sometimes to end at some little 
distance from the margin. In the latter case the lobule is adnate 
to the lobe in the outer part, and the adnate portion is sometimes 
four or five cells across. A somewhat similar condition has been 
described for certain species of Drepanolejeunea.t In all the 
species of Lopholejeunea studied by the writer the free margin is 
entire, except for the apical tooth. In Z. exlopha (Tayl.) Schiffn.,t 
however, according to Schiffner,§ it bears several long cilia, 
* Bull. Torrey Club 32: 275. 1905. 
t Bull. Torrey Club 30: 21. 1903. 
}Engler & Prantl, Nat. Pflanzenfam. 13: 129. 
Lond. Jour, Bot. 5: 391 
3 
. 1846.) 
© eberm. der ‘*Gazelle’’ Exped. 28. 1890. The specimens upon which this 
observation was based were collected on the island of Amboina and showed female 
1895. (= Lejeunea eulopha Tay. 
