Evans : Hepaticae of Puerto Rico 3 



blunt. The lobule just described is built up on essentially the 

 same plan as in the genera Cyrtolejeunea and Euosmolejeunea. 



The second type of lobule (figure n) is well seen in C. versi- 

 folia (Gottsche) Schiffn. and in C. phyllobola (Nees & Mont.) 

 Schiffn.; it corresponds more nearly with that found in Prionole- 

 jeunea and in several other genera of the Lejeuneae Schizostipae. 

 The most important difference between this type of lobule and 

 that described for C. aneogyna is in the position of the hyaline 

 papilla, which is here at the proximal base of the apical tooth. 

 The tooth itself is subject to considerable variation, being long 

 and sharp in C. versifolia and short and blunt in C. pliyllobola ; in 

 some species it is distinctly curved, in others straight or nearly so. 

 The papilla is usually in a distinct depression, which in some cases 

 at least is formed by the curved base of the apical tooth (fig- 

 ' ure 15). 



The third type of lobule is apparently confined to C. lineata 

 (Lehm. & Lindenb.) Schiffn. (plate 3, figures 1-3). It bears a 

 strong resemblance to the spherical lobules found in certain spe- 

 cies of Ceratolejetinea and is possibly to be considered an extreme 

 modification of the second type. It is even more strongly inflated 

 than in the two other types described and is very abruptly con- 

 tracted in the outer part, the opening into the water-sac being ex- 

 tremely small. The keel is so strongly arched as to be approxi- 



ely semicircular in outline. The free margin is rounded and 

 throughout its entire length is involute and appressed to the lobe ; 

 the fold of involution is also strongly arched, very much as in the 

 keel, so that the entire lobule appears broadly ovoid or ellipsoidal 



ma 



mar 



in form. If the free 

 to the end of the keel, a slight indentation may be detected from 

 which a hyaline papilla arises (figure 8). A study of very young 

 leaves shows that the rounded cell just beyond the papilla repre- 

 sents the apical tooth, although it is scarcely to be distinguished 

 from its neighbors. The papilla, therefore, is proximal in posi- 

 tion. The sinus is represented by the very few cells between the 

 apical tooth and the end of the keel and is consequently unusu- 

 ally short. The hyaline papilla in C. lineata was noticed many 

 years ago by Leitgeb.* It is, however, difficult to demonstrate 



*Unters. iiber Lebermoose 2 : 14. 1875. 



