amarisci.J 
BRITISH JUNGERMANNIiE. 
Plant spreading in large patches of great extent, loosely attached to its place of growth. 
Surculi from two to four inches in length, laxly imbricated, creeping, flexuose, filiform, 
of a deep brown, sometimes a black color, branched in a pinnated or bipinnated 
manner with patent or horizontal pinnae, for the most part alternate, and standing two 
or three lines from each other, short, but of unequal lengths, and beset with still 
shorter patent pinnulse. 
Leaves (f. 4) bifarious and distichous : at the base the shoot is generally bare, or, at 
most, has the leaves distant and much decayed, while in the other parts they are 
densely and alternately imbricated over the whole upper surface of the surculus : they 
are about one third of a line long in the larger branches, except at their apices, 
where, as well as on the smaller ramuli, they are much smaller, and scarcely exceeding 
half that size; in the fertile shoots, on the contrary, they are smaller at the base, and 
gradually increase in size towards the extremity ; their shape is ovate, more or less 
approaching to round, convex above, the margins a little involute, especially towai’ds 
the ends of the leaves, which, indeed, in dried specimens, are generally so much so as 
to embrace the under side of the surculus : their color, like that of J. dilatata, varies 
from a deep purplish brown to a yellow or dirty green ; above they are glossy : the 
cellules, of which the leaf is composed, are small, roundish, forming a most beautiful 
minute reticulation. Attached to the lower margin of the leaf is an auricle, appressed 
to its inner surface near the point of insertion, scarcely equalling the twentieth of 
a line in length, obovate, inflated, having no visible opening below at the base; on 
the third or fourth pair from the apex of the fertile shoots, however, an oblong 
opening is evident, and in proportion as they are situated nearer the calyx, this 
vesiculated appendage becomes more expanded, so that, in the second pair from the 
calyx, it is about one fourth of the size of the leaf, oblongo-ovate, obtuse, convex 
on its under surface, concave on its upper, the margins revolute. 
The perigonial leaves, from six to eight in number, are closely tiled over each other, 
of a roundish figure, ventricose ; their auricles, too, are ovate, ventricose, and closely 
imbricated. 
The perichatial leaves (f. G), of which there is one pair to each calyx, are ovate, acute, 
and strongly serrated, having their auricles about one-fourth of their size, oblong, 
and acute, with revolute and laciniated margins : they are appressed with their inner 
and keeled surface to the side of the calyx. 
Stipules (t. 7) one to each pair of leaves, subquadrate, longer than they are broad, and 
widei than the stem, to which tb«^ are closely appressed: the margins are revolute, 
the apex emarginate, obtusely for the most part, but, as they approach the calyx 
(t. 8), they become larger, and mo;e deeply and acutely emarginate, and the extreme 
or calycine one is bifid, with long, recurved, laciniated segments. 
Male Fructification situated upon lateral ramuli, so short, that, taken with the perigonial 
they aic of a roundish figure, inclining to ovate 5 the leaves are, moreover, so 
lkably convex 01 rather ventricose, that the margins, where they meet on the upper 
e, are defined by a deep longitudinal groove or furrow. In each axilla are two or 
Thermal anthers, in every respect resembling those of J. dilatata. 
