(3. bidentata.J 
BRITISH JUNGERMANNIaE. 
Surculi from an inch to an inch and an half long, procumbent, flexuose, branched, with the 
blanches often erect towards the extremity, simple, or occasionally producing a short 
lateral shoot ; their color varies from a pale, to a deep, and almost black green, in 
certain situations ; the texture is rather firm, the cellules compact. 
Leaves (f. f. 4. 5) from half to three quarters of a line or even more in length, closely 
placed, but scarcely so much so as to be imbricated, in a bifarious manner, plane, or 
very slightly waved, horizontal, of a widely ovate* figure at the base, half surrounding 
the stem, and having the lower margin very much decurrent; at the extremity they are 
divided for about one fourth or one fifth of their length, with a sinus more or less acute, 
into two, equal f, sharp, and strait segments, the tips of which resemble minute cilia 
or teeth, whence the plant has its name. The color of the leaves is always a singularly 
light green, sometimes almost approaching to white; the texture thin; the cellules large, 
and forming, with their interstices, a beautiful soil of reticulation. 
Peri gonial leaves about ten or twelve in number, either placed quite at the extremity, or 
at the middle of a branch, ventricose, crowded, and lying closely imbricated over one 
another in two rows, as is the case with those of J. asplenioid.es ; in like manner, also, 
their apices are recurved, and divided into two, three, or even four sharp and’ often 
unequal segments. 
file Periciiceiiat leaves (f. 7) may be said to commence with the second pair of leaves from 
the calyx, which, however, scarcely differ from the rest, except in being longer and more 
inclined to be erect; the first pair are twice the length of thecauline leaves, quite erect, 
and appressed to the calyx, deeply divided into two, equal, lanceolate segments, which 
are here and there dentate or ciliate on the margins. 
Stipules (f. 6) one to every pair of leaves, appressed to the under side of the surculus 
oblong, generally divided into two, and sometimes three, principal segments, which are 
variously laciniated. 
The Male 1-ructification, which I was not fortunate enough to possess in a good state, till 
it was too late to add it to the figure, is readily discovered by the singular disposition of 
the perigonial leaves, in the axillae of each of which are situated two or three spherical 
or somewhat ovate anthers, terminating short, white, transversely striated footstalks or 
filaments. 
f em ale Fructification terminal upon the surculi and upon the small lateral shoots. 
Cahjx (f 8) about a line long, sometimes slightly incurved in an early state of the 
fructification, ovato-oblong, obtusely triangular; the mouth, though slightly contracted, 
preiiouslv to the emission of the capsule, is afterwards somewhat expanded, it has a 
rather deep incision on one side, and is bordered with numerous lacinhe. The texture 
and color of the calyx scarcely differ from those of the leaves. 
Calyptra (f. 9) pale brown, thin, reticulated: style short, tubular. 
plant 
V. eber describes the leaves to be “ ex ovato subquadtata ;” which does 
not exactly correspond with those of 
our 
t According to Dr. Smith's figure and description, in English Bntany, it would appear that the segments are 
occasionally o. unequal size : I have never remarked them to be so myself. 
