BRITISH JUNGERMANNI^E. 
(J. cordifolia.J 
JUNGERMANNIA CORDIFOLIA. 
(TAB. XXXII.) 
Jungermannia, caule erecto, flexuoso, dichotomo : fbliis erectis, concavis, cordatis, circumvolutis : 
fructu terminali axillarique ; calycibus oblongo-ovatis, subplicatis ; ore minuto, denticulato. 
Hab. Highland Mountains of Scotland, in many moist situations. — Mr. Woods finds it in 
Ireland; and Mr. Lyell, at Isla and Catlaw, in Angus-sbire. (Calyces were discovered, 
with swollen germens, on the thirty-first of August, by Mr. Lyell.) 
Plant growing in rather dense tuffs, conspicuous from their black appearance, one or two inches 
in diameter. 
Root a very few minute, simple fibres, proceeding almost wholly from the base of the plant. 
Stems varying from one to two and even three inches in height, flexible, waved, cellular, 
always erect and filiform, sometimes simple, but more frequently branched in an 
irregularly dichotomous manner; with branches of uncertain length, simple, or at most 
producing one or two young lateral shoots; their color a dirty green or brown. 
Leaves bifarious, rather distantly placed, from half a line to a line or more in length ; the 
lower and the terminal ones generally the smallest: all of them erect, or erecto-patent, 
loosely imbricated, cordiform, concave, with their margins embracing the stem so as 
entirely to conceal it : their texture is extremely thin, membranous and subdiaphanous ; 
the cellules of a roundish figure; their color a very dark olive or almost black green, 
* 
varying, in some situations, to a deep purple towards the extremity of the plant. The 
leaves on the innovations exactly resemble the rest in figure, but are much smaller and 
have their margins more involute and more closely embracing the stem ; the apices, 
however, are a little patent, so that these young shoots at first sight have somewhat the 
appearance of a Sertularia. In drying, the leaves become much crisped, and do not 
recover in water without much difficulty. 
