( J. hamatifolia.J 
BRITISH JUNGERMANNIJ?. 
of a line in length, very convex on its superior surface, of an ovate figure, acuminate at 
the extremity, where it is often curved in various directions, but usually downward : the 
margins are either entire (f. 5), or serrated (f. f. 4. 7), a circumstance that varies much 
in different individuals, and even on the same shoot, though the former appearance is the 
most common : the lower lobe is about half the size of the upper, which it resembles in 
shape, and is remarkably involute, having its margins sometimes, though rarely, very 
slightly serrated. The substance of the leaves is rather thick and subcarnose for so small 
a plant j the cellules small, round, a little prominent. The color pale green. 
Perigonial leaves generally to be found at the extremity of a surculus, scarcely differing from 
the rest, except in being ventricose at their base, and placed in a more crowded and 
somewhat imbricated manner. 
rerichcetial leaves (f. f. 3. 4. 9. 10) almost twice the size of the eauline ones; two attached 
to each calyx, the base of which they embrace : They are ovate, approaching to round, 
nearly plane, divided, for about one half of their length, into two, ovate, but unequal, 
upright, acute segments or lobes, of which the margins are sometimes entire, but more 
frequently elegantly and very conspicuously serrated (f. f. 9. 10.) 
Stipules (f. f. 7. S) small, ovate, acutely cleft for nearly half their length into two sharp, 
equal segments, which appear to be always entire at their margins. 
MalF. Fructification; a single spherical Anther, situated in the axilla of each perigonial leaf; 
it is faintly reticulated, of a pale yellowish ash color : the footstalk is white, pellucid, and 
transversely striated. 
Female Fructification lateral. 
Calyx more than a quarter of a line long, ovate or obovate, often attenuated at the base, 
distinctly ribbed with five prominent and acute angles, reaching from the extremity 
nearly to the base; these are either entire (as at f. 10), or strongly serrated (as at f. 3). 
The mouth is much contracted, and generally also elevated and tubular, cut into many 
fine and sharp teeth. 
Cermen (f. 11) ovate, contracted at the base ; style rather long, tubular. 
Catyptra (f. 12) ovate, whitish, reticulated. 
Peduncle scarcely exceeding the length of the calyx more than half a line, divided, by means 
of transverse septa, into short joints, which again appear striated longitudinally, in 
consequence of the numerous narrow, and tubular cellules of which they are composed. 
Capsule exactly spherical, white, pellucid, membranous, reticulated, opening into four equal 
segments, or valves, which are only half as long as the capsule, and at their apices 
support ihe 
Spiral filaments, adhering to them by their bases : each composed of a double helix, slightly 
twisted, and enclosed in a pellucid tubular membrane. The seeds, though by no means 
exactly spherical, are more so than those of J. catyplrifolia and J. serpyllifolia, and are 
of a green color, inclining to olive. 
The leaves of r ar. (S present under the microscope a highly-beautiful and singular appearance; for 
each cellule, upon their surface and margin, which in the common state of the plant is, at most, 
convex or slightly prominent, is here so much so, and so acuminated as to appear altogether 
ecliinated ; a peculiarity that is not confined to the eauline leaves, but. extends to the perichsetial 
ones, and to the calyx. The cellules of the stems, too, are more than usually convex. 
