LICHEN glaucus.
Glaucous Leafy Lichen.
CRYPTOGAMIA Algce.
G e n . C h a r . Male, scattered warts.
Female, smooth shields or tubercles, in which the
seeds are imbedded.
S p e c . C h a r . Membranaceous, smooth, polished on both
sides, lobed, jagged and curled; glaucous above;
black beneath. Shields marginal, slightly bordered,
red brown; at length flat, smooth.
S y n . Lichen glaucus. Linn. Sp. PL 1615. A char.
Prod. 167. Huds. 543. With. v. 4. 5 3 . Hull. 296.
_ Light/. 838. Sm. Tour, v. 1 .3 3 6 .
Lichenoides endivias foliis crispis et splendentibus,
subtus nigricantibus. Dill. Muse. 192. t. 25. f . 96.
Cetraria glauca. Ach. Meth. 296.
T h i s Lichen is found in mountainous countries on rocky
moors or heaths, as well as on the trunks of old trees. The
late Rev. H. Bryant first observed it in Norfolk on old pales at
Sail. The Rev. G. R. Leathes sent us specimens from damp
parts of the heath near the place of growth of Buxbaumia
aphylla, t. 1596. We subjoin a figure of the only British specimen
we have ever seen in fructification, communicated by
Mr. Dickson from Scotland, which is the more valuable, as
Acharius himself never saw the shields, and it is not clear that
Dillenius really knew them.
The fronds form loose straggling tufts, and are thin and
membranous, very pliable when wet, smooth and shining on
both sides when dry, variously lobed, sinuated and curled;
glaucous variegated with brown above; black, but pale at the
edges, underneath. The shields grow on or near the margin,
almost sessile; when young they are convex, with a jagged in-
flexed border of the substance of the frond; when old they are
flat; at all times smooth, of a red brown, or bay colour.
y WRen the frond is morbidly inflated it becomes the L. am-
pullaceus of Linnaeus, as I have verified bv specimens belonging
to Mr. Menzies. See Trans, o f L . Soc. v. 7 . 1 1 2 , and
Ach. Meth. 297.