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L IC H E N scorteus.
Leathery Granular Lichen.
CRYPTOGAMIA Algce.
G en. Ch a r . Male, scattered warts.
Female, smooth shields or tubercles, in which the
seeds are imbedded.
Spec. Ch a r . Leafy, slightly imbricated, greyish-white,
even and smooth, besprinkled with innumerable dark
granulations; its segments rounded, lobed and wavy;
black and rough beneath. Shields bright chesnut.
Syn. Lichen scorteus. Ach. Prod. 119.
L. tiliaceus. Ehrh. Crypt. 59.
L, n. 955. Leers. Herborn. 258.
Parmelia scortea. Ach. Meth. 215.
GATHERED on trees and pales in Sussex and Surrey by
Mr. W. Borrer, who, like ourselves, has,also received it from
the Rev. Mr. Harriman and the Rev. G. R. Leathes, but it
is always barren in Britain, as Leers, Ehrhart and Acharius
found it on the continent. The latter however, since his
Methodus appeared, has obtained the shields, and we are indebted
to him for those in our plate. They are small, but
otherwise exactly like those of saxatilis, and other species
allied to it, for in this tribe of Lichens the specific differences
are chiefly observable in the frond.
This has the habit of saxatilis, t. 603, and Borreri, t. 1780,
but is neither pitted or reticulated like the former, nor besprinkled
with white powdery warts like the latter; while it
further differs from both in having its central part all covered
with innumerable, minute, dark, powdery granulations, each
tipped with white. From tiliaceus, t. 700, and leevigatus,
t. 1852, it abundantly differs. The lobes are a little dilated,
very smooth and even, rounded, notched and wavy, of a
light-greyish white, not shining, but very conspicuous when
dry. The under surface is clothed with very black fibres,
almost to the extremities, which are rough and tipped with
shining browp,.