BRITISH J UNGERM ANNIAS. 
(J. hibernica.J 
JUNGERMANNIA HIBERNICA. 
(TAB. LXXVIII.) 
Jungermannia, fronde oblonga, dichotomy tener&, costata, margine integerrimo : fructu e superiore 
parte frondium ; calyce duplici; exteriore perbrevi, laciniato; interiore longb exserto, ovato- 
cylindraceo, subplicato ; calyptrff calyce interiore multo breviore. 
Hab. Among Sphagnum cuspidatum and Jungermannia emarginata, on the shores of Lough 
Bray, a very elevated situation, near Dublin. Dr. Taylor. Catlaw, near Kinnordy, 
Angusshire. Mr. Lyell .—( It produces ripe capsules about the middle of April.) 
Plant growing intermixed with various Mosses and other Jungermannise, in small, loosely- 
entangled, imbricated patches. 
Roots few, and principally proceeding from the lower parts of the frond, small, fibrous, 
pellucid, simple. 
Frond from two to four inches long, procumbent, oblong, about two, or, towards the 
extremity, where it is always the broadest, even three lines in diameter, once, twice, or 
even thrice branched, the fertile plants the most so, and always in a dichotomous 
manner : the branches sometimes very patent : the whole plant is more or less waved or 
undulated, but especially at the margins, which are quite entire, never producing teeth, 
as in J. Lyellii. Like that plant, the substance is very delicate, pellucid, reticulated ; 
but the nerve scarcely differs from the rest of the frond, except in its thickness, and in 
the more compact situation of the cellules, never having its internal substance so hard, I 
might almost say, ligneous, as in the last-mentioned species. The color is a pale green, 
at the base yellowish brown. 
I have seen no innovations on this species. 
The Male Fructification (f. f. 2 to 4) is produced upon the nerve on the upper side of the frond, 
as far as I am able to discover, always on distinct individuals from the female. 
Perigonial scales few, distantly placed, arising from the top of the nerve, and closely 
appressed to it, but having an oblique direction, alternately pointing to the right and 
left (f. 3), and extending nearly the whole length of the plant; each of them is of an 
ovate figure, convex on its upper surface, at the margins slightly and irregularly toothed. 
(f. f. 4. 5. 6) 
