Evans: NEw WEstT INDIAN LEJEUNEAE 605 
single projecting cell. Closer inspection, however, shows that the 
conditions are more complicated, and that a second cell on the 
inner surface of the lobule is coalescent with this projecting cell 
and with the two cells at its base. In other words the lobule is 
two cells thick where the proximal tooth is situated, a peculiarity 
which has not yet been recorded in any other member of the genus. 
The divisions of the underleaves often attain a width of from ten 
to twelve cells. 
» Five species of Diplasiolejeunea are now definitely known from 
Jamaica, the others being D. pellucida (Meissn.) Schiffn., D. 
brachyclada Evans, D. unidentata (Lehm. & Lindenb.) Schiffn., and 
D. Rudolphiana Steph. Since these species occur also in Puerto 
Rico, they have been described and figured by the writer.* Two 
of them, D. brachyclada and D. Rudolphiana, agree with D. John- 
sonti in being autoicous, while the two others are definitely dioic- 
ous. In D. Rudolphiana and D. unidentata, which seem to be 
closely related to the new species, the lobes of the leaves, although 
convex, are not revolute in the vicinity of the keel, so that the end 
of the sinus is not displaced. The underleaves in these two species 
have much in common with those of D. Johnsonti, and their 
divisions are fully as broad; they show, however, a distinct nar- 
rowing toward the apex. Their lobular teeth show much more 
striking differences. In D. Rudolphiana the apical tooth is re- 
markably long and slender and is usually subparallel with the 
axis instead of being broadly triangular and spreading obliquely. 
In D. unidentata the tooth is oblique and about as long as in D- 
Johnsonii, but it is more slender and is usually tipped with two 
superimposed cells, a condition rarely found in the new species. 
The most important differences in the proximal teeth have already 
been mentioned. In the material collected by the writer D 
brachyclada grows mixed with D. Johnsonii, but the two species 
are amply distinct. The underleaves of D. brachyclada have 
narrow and sharply pointed divisions, the apical teeth of the 
lobules are often truncate or t-shaped and are usually only one 
cell broad, the perichaetial bracts and bracteoles are more deeply 
bifid, and the divisions of the latter are acute. Similar differences 
* Bull. Torrey Club 39: 209-225. pl. 16,17. 1912. 
