282 Evans: HEpATICAE OF PuERTO RICO 
This is usually accompanied by a more vigorous cell division and 
gives rise to gemmae composed of from twenty to twenty-four cells. 
In the gemmae of Cololejeunea diaphana there are also only three 
segments cut off as a rule, the number of cells at maturity being 
twenty. In one instance, however, a gemma was observed in 
which one of the apical quadrants had cut off four segments and 
in which the total number of cells was twenty-two (TEXT FIGURE I, 
x B 
IGURE I. Gemmae, X 300. The apical cells are indicated in the usual way. 
A. A phanolejeunea microscopica; Argyllshire, Scotland, Macvicar. B. Cololejeunea 
myriocarpa; near Cayey, Puerto Rico, Evans (ror). C. C. Macounii; British Colum- 
bia, Macoun (Hep. Amer. 177). D. Leptocolea ovalifolia; Oahu, Hawaiian Islands, 
. E. L. cuneifolia; Kamerun, Dusén (Hep. Afr. sor)... F. Cololejeunea dia. 
phana; near Santurce, Puerto Rico, Heller (464). 
F). In the gemmae of Cololejeunea minutissima, Leptocolea 
Jooriana, and L. scabriflora four segments are cut off (TEXT FIGURE 
2, A, B; PLATE I1, FIGURE 8). In C. minutissima the subsequent 
divisions are very numerous and gemmae with as many as thirty- 
four cells are sometimes found. In the other two species the 
number of cells seems to be pretty constantly twenty-four. The 
most complicated gemmae, in which five segments are cut off, are 
found in four species of Leptocolea, namely: L. lanciloba, L. longi- 
stylis (Evans) comb. nov.,* L. ceatocarpa, and L. Goebelii (TEXT 
FIGURE 2, C, D;3,A,D). In the first two, where the cell division 
is especially active, the mature gemmae are composed of forty 
* = Cololejeunea longistylis Evans, Trans. Conn. Acad. 10: 453. pl. 59. f. 8-16. 
1900. Known from the Hawaiian Islands only. 
