i7 
Evans,— Branching in the Leafy Hepaticae \ 
from the beginning. In the form figured there are no distinct underleaves, 
the only ventral appendages being hyaline papillae which sometimes cut off 
a few cells at the base. A group of these papillae can usually be distin- 
guished at the base of a branch in the position where an underleaf would 
naturally appear. 
In addition to the branches just discussed, Muller, in both L. inflata 
and L. acutiloba , describes cases in which the leaf below the branch is 
bilobed instead of being undivided. This condition does not seem to be 
infrequent and is shown in Fig. 2,2. It will be seen that the leaf below the 
branch (the lower leaf on the right-hand side) looks like the other leaves 
except that its line of attachment is shorter. If it were not for this slight 
difference and for the difference in the sequence in which the leaves are 
borne, it would be difficult to distinguish the 
branch from the branching axis. M tiller refers 
branches like this to the Radula type instead 
of to the Frullania type. There are, however, 
two objections to this interpretation; first, the 
sequence in which the leaves of the branch are 
borne, and, second, the short line of attachment 
of the leaf below the branch. In the writer’s 
opinion the branches shown in the two figures 
of L. inflata ought both to be referred to the 
Frullania type. The presence of two lobes 
in one of the incomplete leaves could then be 
ascribed to the tendency, which so many 
species of Dilophozia show, to develop 
more than the normal number of lobes. The Fig . 23 . jamesoniella autum- 
terminal branches in L . acutiloba are in all Cromwell Connecticut (A. 
W. E.). x 17. 
essential respects like those of L. inflata. 
Jamesoniella . — In J. autumnalis , a species which is aberrant in certain 
respects, branching of the Frullania type can occasionally be observed. In 
all typical members of the genus the branches are apparently always inter- 
calary and ventral. J. autumnalis is widely distributed throughout North 
Temperate regions. The leaves (Fig. 23) are undivided and rounded, and 
the line of attachment is long and oblique. The minute underleaves are 
often short-lived and difficult to demonstrate among the rhizoids. The 
incomplete leaf at the base of a branch is coalescent with a lobe-like 
appendage at the ventral base, similar to the one figured in Lophozia 
Wenzelii. The appendage varies considerably in size and in the extent of 
coalescence ; the apex varies also from acute (as shown in the figure) to 
obtuse or rounded. The first underleaf of a branch tends to be a trifle 
larger than normal underleaves, but the other branch-leaves show no 
modifications of interest. 
C 
