Evans: HEeEpaticaE OF Puerto RIco 191 
ago reduced by Gottsche * to a synonym of O. /unulata and was 
afterwards so regarded by Montagne himself.+ Spruce separates 
his plant on account of the acuminate spurs into which the basal 
angles of the underleaves are said to be produced. In the speci- 
mens distributed in Hepaticae Spruceanae this peculiarity is not 
very clearly exhibited, and many of the underleaves are no more 
spurred than is usual in O. /enxulata,; it is therefore difficult to 
form a definite opinion as to the validity of Spruce’s species. 
Judging from the distributed specimens alone the plant is hardly 
worthy of specific rank. 
VEGETATIVE REPRODUCTION IN ODONTOLEJEUNEA 
Leafy propagula have been observed by the writer in O. dunu- 
lata and also in O. Sieberiana and are essentially alike in the two 
Species. They are much less abundant than in certain species of 
Leptolejeunea and Drepanolejeunea and are apparently never borne 
on specialized microphyllous branches as is so often the case in 
those genera. Germinating propagula may readily be found in 
the vicinity of an older plant, but so far only three cases have 
been noted in which the propagulum was still attached to the 
parent axis. In one of these it grew out just behind an ordinary 
branch-leaf at some distance from the apex of the branch (PLATE 
8, FIGURE 12); in the other two cases it occupied a similar posi- 
tion with respect to a bract in the middle of a long antheridial 
spike. In all three cases the empty sheaths of older propagula 
could also be demonstrated, and these were always larger and more 
conspicuous than the basal sheaths of ordinary leafy branches. 
In two of the cases noted the propagulum arched forward across 
the axis in such a way as to turn its morphologically postical sur- 
face upward, very much as in Lepfolejeunea exocellata ; in the third 
case the propagulum spread widely from the axis and turned its 
postical surface downward as in a normal branch. 
The first leaf of a propagulum is smaller than the first leaf of 
an ordinary branch and is obovate in shape (FIGURE 13); it is 
moreover strongly reflexed and its lobule is practically obsolete, 
being represented merely by a hyaline papilla. The second leaf 
* Syn. Hep. 326. 1845. 
ft Sylloge, 72. 1856. 
