BRITISH J UNGERM ANNUv 
( J . DonnianaJ 
JUNGERMANNIA DONNIANA. 
(TAB. XXXIX.) 
Jungermannia, caule erecto, subsimplice, filiformi, flexuoso: foliis arete imbricatis, subho- 
rizontalibus, oblongo-ovatis, coucavis , apice bidentatis, falcato-secundis. 
Hab. Discovered by Mr. George Down, in 1795, upon the highest mountains of Clova, 
in Angus-shire, and on Ben Lawers and Ben Nevis ; again found in 1802, on Cairn- 
gorum, and in September, 1802, on Ben-na-bord and Ben-Mac-Davie, two moun- 
tains North of the Dee. 
Plant growing in rather small and loosely-entangled tufts, intermixed with other species of 
Jungermannise and Mosses. 
Of the roots, I have not been able to find any traces, and, indeed, the lower pait of 
the plants (whence, probably, the roots originate) are so much matted together, and 
so brittle, that it is scarcely possible to separate an entire individual from the tuft. 
Stems from one to two or even nearly three inches in length, and about the thick- 
ness of horse-hair, erect, filiform, flexuose, of a rigid, and, in a dry state, fragile 
nature, somewhat ligneous, opaque, exhibiting no cellular texture, of a purplish-brown 
color, often verging to a black, either simple, or occasionally interrupted by one or 
two scattered young shoots, which, except in size, differ in no respect from the 
parent stem. 
Leaves (f. f. 3. 4. <5) closely imbricated in a bifarious manner over the posterior surface 
of the stem, and with great regularity throughout its whole length, about half a line 
long, of an oblongo-ovate figure, very concave, having the sides not unfrequent ly 
incurved; at the base they are slightly decurrent; at the apex divided by an acute 
sinus, which is often concealed by the involute margin of the extremity (see f. 5), 
into two small, and rather obtuse teeth; with regard to position, they arc nearly 
horizontal, slightly falcate, sometimes distichous, (f. f. 3. 4) but far more generally 
