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L I C H E N glebulosus.
Broken-crusted Brown-shielded Lichen.
CRYPT0GAM1A Algm.
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 . Crust imbricated, minutely lobed, dir
spersed, glaucous-white; lobes rounded, convex,
adherent. Shields convex, deep red-brown, with
a thin entire border of the same colour.
§ y n . Lecidea testacea. Winch Guide, v. 2. 42.
A b u n d a n t on quartzose rocks at Lanchester, and walls
at Knitsley, Durham, according to Mr. Winch, to whom we
are indebted for this specimen. We are nevertheless obliged
to correct its appellation in that gentleman's work, and to describe
it as a new species, the Lichen saxifragus of the Linn.
Trans, v. 1 . t. 4.ƒ. 4, Psora testacea of Hoffmann,7 beinOg a
totally distinct! plant.
The crust of L. glebulosus is, as the name implies, composed
of innumerable minute fragments or portions, so that
it cannot be separated entire from the stone; and those fragments
consist of little, imbricated, rounded, convex, often
notched, lobes or leaves, smooth and of a pale glaucous white
on their upper side, the under being closely adherent to the
stone. The aggregate crust has a dirty aspect, from the interstices
being darker, or occupied by adventitious matter.
The shields are scattered, sessile, small, though much larger
than the lobes of the crust; when fresh of a dark but reddish
brown, somewhat convex and thick, encompassed with a thin
even border, of their own substance and colour, though rather
paler. When dry they are almost black.