Evans: HEpPATICAE OF PuERTO RIco 283 
or more cells; in L. ceatocarpa the number of cells is usually 
thirty-eight, while in L. Goebelit it is only thirty,—fewer than in C. 
minutissima, in which only four segments are cut off. 
Aside from the differences in the number of segments and in 
the number of cells present at maturity, the gemmae of different 
species are characterized by peculiarities of the marginal cells, by 
the presence or absence of ‘‘ Haftorgane,”’ or organs of attachment, 
and by the number and situation of these organs. With regard to 
the margin there are certain species in which none of the marginal 
Fic, 2. Fic. 3. 
Ficure 2. Gemmae, X 300. A. Cololejeunea minutissima; Florence, Italy, 
Levier. B. Leptocolea Jooriana; Lisbon, Florida, Underwood (95). C. L. lanciloba; 
Oahu, Hawaiian Islands, Cooke. D. L. longistylis; Oahu, Hawaiian Islands, Cooke. 
lea Goebelii; Tjibodas, Java, Fleischer. 
FIGURE 3. Gemmae, X 300. A. Lepi 
B. L. ceatocarpa; Hawaiian Islands, Heller (2562). 
cells project. This is true, for example, of L. lanciloba, L. longi- 
stylis, and L. ovalifolia, and the margin in these may be described 
as perfectly entire. It is much more usual, however, for some or all 
of the cells to project in the form of crenulations or denticulations, 
according to whether they are convex or conical. In gemmae with 
convex cells, the margin is sometimes crenulate throughout as in 
Cololejeunea myriocarpa, C. minutissima, C.~ Macounti, arid 
Leptocolea Jooriana. In L. ceatocarpa, however, only the marginal 
