( J . juniper init.J 
BRITISH JUNGE11MANNI2E. 
more exposed situations. The substance is extremely rigid, composed of distantly- 
placed, oblong, opaque cellules, the interstices of which are pellucid. 
Peiichcetial leaves numerous, crowded, so united together at their bases as to constitute 
a complete calyx: their acuminated segments alone are free, and form a laciniated 
margin. 
Male Fructification I hare never seen. 
Female Fructification terminal. 
Calyx (f. 6) about three-quarters of a line long, an ovate, plicate, tubular membrane, 
formed, as before observed, by the union of several of the perichaetial leaves, the lower 
undivided halves of which grow so entirely joined, that no suture is visible, while the 
segments, remaining separate, exhibit the appearance of a quantity of erect lanceolate 
laciniae, exactly equal in number to double the quantity of leaves connected. 
Calyptra ovate, white, semi-transparent, tipped with a short brown style, and sur- 
rounded at the base by numerous greyish abortive pistilla, which are almost linear, 
or slightly incrassated towards the base. 
Peduncle short, scarcely two lines in length, white, pellucid, cellulose. 
Capsule subrotundo-ovate, dark brown, dividing into four equal ovate valves. 
Seeds and spiral filaments (f. 7) of a deep fulvous color; the former spherical, the latter 
composed of a double helix, slightly attenuated at each extremity. 
J. juniperina has no affinity whatever with any British species, but approaches, as well in habit 
as in the texture of its leaves, to a Jungermannia not yet described, gathered in New Zealand, 
by Mr. Menzies. After a most careful examination of authentic specimens of Mr. Dickson’s 
J. adunca, compared with others of J. juniperina , which I have received from Dr. Swartz, I 
am not able to find any characters which can induce me to keep them separate. The latter 
plant is indeed of a laiger size than the former, and possesses one striking peculiarity, which 
is, that, on immersing a dry specimen in water, the absorbent vessels are immediately put 
in action, and the remarkable divarication of the segments of the leaves, noticed by Dr. Swartz, 
appears almost at the same moment: the latinise of the calyx, too, become reflexed. Our 
British variety, on the contrary, recovers extremely slowly in water, and after an immersion, 
even of very long duration, the segments of the leaves still remain strait, and those of the 
calyx erect. It is singular that the only stations of this plant at present known are the loftiest 
of the British Alps and the blue mountains in Jamaica. 
Specimens in fructification of my var. f3 are of rare occurrence. I possess them only 
through the kindness of Mr. Dickson, who gathered them in Scotland. The figure and 
description of the species in the Fasc. Plant. Crypt, are good, except that they represent it as 
having undivided leaves. The peculiar structure of the calyx did not escape the observation 
o the author of the Flora Indice Occidentalis, who has accurately described the Jamaica variety 
m the following words : “ Perianthemum e foliolis externis, confertis, bipartitis, patenti-reflexis : 
intimis eiectis, indivisis, carinatis, conniventibus, pallidis, rigidis.” 
