1903] ODONTOSCHISMA MACOUNII AND ITS ALLIES 335 
O. Sphagni and in O. prostratum, gemmae are apparently never 
produced, but they occur more or less frequently in our other 
species, and in O. denudatum they may be found even on fruiting 
individuals. In this species the gemmiparous branches are the 
upright continuations of prostrate branches, and the formation of 
the gemmae soon puts a stop to further elongation. The leaves 
and underleaves on these branches are scarcely distinguishable 
from each other; they are distant and strongly squarrose, and 
become smaller and smaller toward the apex of the branch. In 
O. Gibbsiae (fig. 29) and in O. Macounti the gemmiparous branches 
are prostrate or ascending, but they likewise show three ranks of 
leaves, the underleaves being distinguishable only by their posi- 
tion. In both these species the leaves are concave, loosely im- 
bricated, and relatively longer than ordinary leaves. Sometimes 
a branch of this character attains a considerable length, but its 
growth is ultimately terminated by the formation of gemmae. In 
O. Macounii gemmiparous branches are much less frequent than in 
O. Gibbsiae. The gemmae themselves are similar in the different 
species. They are oval or spherical bodies and are composed ot 
two cells, or more rarely of a single cell. In O. denudatum they 
are thin-walled, while in our other two species (fig. 28) they 
are thick-walled. In the lower part of a gemmiparous branch 
the leaves bear gemmae on their margins and outer surfaces; in 
the upper part the rudimentary leaves and the stem-apex become 
wholly transformed into a mass of gemmae. 
COMPARISON OF THE GENERA ODONTOSCHISMA, ANOMOCLADA, 
AND CEPHALOZIA. 
One of the most striking peculiarities of the genus Anomo- 
clada, as described by Spruce, is the secretion by the underleaves 
of so much slime that it literally floods the entire plant. In the 
original paper on this genus”* it was further stated that ‘the mar- 
ginal and apical cells { ofthe underleaves | were continually swelling 
and discharging their protoplasm, adhering for awhile as empty 
bleached bladders, then falling away, for the succeeding cells to 
undergo the same process.” Spruce also called attention to the 
*Journal of Botany 5: 130. 1876. 
