BRITISH J UNGER MANNI/E. 
( J . umbrosa.J 
JUNGERMANNIA UMBROSA. 
(TAB. XXIV.) 
Jungermannia, caule ercctiuseulo, subramoso : foliis bifariis, insequalithr bilobis ; lobis 
conduplicatis, apice serratis, acutis ; inferioribus majoribus, ovatis ; superioribus rotundato- 
ovatis : fructu terminali 5 calycibus oblongis, incurvatis, compressis ; ore truncate), integerrimo. 
Jungermannia umbrosa. Schrader, Samml. ii. p. 5. Roth, Germ. in. p. 390. 
Hab. On Ben Nevis, and in the Den of Rechip, near Dunkeld. — Mountain, near 
Powerscourt Waterfall, Ireland. Mr. Maclcay. — Gathered in fructification, in the 
months of April and May, npon Boulacross Mountain, in the county of Wicklow, 
by Dr. Taylor and Mr. Mackay. 
Plant growing in rather small and dense patches, among other Jungermanniae and Mosses. 
Root consisting of a number of minute fibrous radicles, principally issuing from the 
lower part of the plant. 
Stems short, generally not much exceeding half an inch in length, erect or ascendent, 
flexuose, of a pale reddish-brown color, simple, or once or twice dichotomous ; but 
producing also young lateral shoots, sometimes singly, sometimes two or three together, 
from near the extremity (f. 3). 
Leaves (f. f. 5. 6 ) bifarious, distichous, horizontal, rather closely placed, imbricated, 
divided into two unequal, conduplicate, appressed, and vertical lobes, of which the 
inferior is much the largest, and is half a line long, ovate, acute, recurved, especially 
in those that approach the apex of the stem (f. 3), and sharply serrated, though the 
serratures are irregular in size and distance, and do not extend more than half way 
down the margins from the point: the superior lobe is not so large by two-thirds 
as the inferior ; it is of a rotundo-ovate figure, acute, its exterior surface convex, 
its apex sharply, but unequally, serrated. The color of the leaves is a pale and bright, 
yellow grqen, sometimes inclining to brown, the terminal ones often tipped with a 
fine purplish tinge. The texture is rather firm and rigid. The cellules roundish, 
minute. 
In the perigonial leaves, which I have only hitherto observed to be situated about 
the middle of the stem, the lobes are almost equal in size, and not at all serrated. 
These are closely imbricated. 
The periciuetial leaves resemble the cauline ones in every thing but in having the 
inferior lobes more recurved, and the superior about halt their size. 
