LICHEN corrugatus.
m 'in kled-shielded Lichen.
CRYPTOGAMIA Algce.
G en. Char . Male, scattered warts.
Female, smooth shields or tubercles, in which the
seeds are imbedded.
Spec. Cha r . Leafy, creeping, plaited, somewhat rugged,
of a dark glaucous green ; underneath blackish
and fibrous: its lobes rounded and imbricated.
Shields concave, rusty brown, externally wrinkled,
with a notched and wrinkled margin.
Syn . Lichen corrugatus. Tr. o f Linn. Soc. v. I. 83.
Ach, Prod. 1 2 2 . Schrad. Spicil. 98.
Lichenoides acetabulis cutaneis et rugosis. D ill. Muse.
185. t. 24>.f. 79.
Parmelia corrugata. Ach. Meth. 2 1 5 .
I HAD the good fortune to gather the first specimen of this
Lichen ever observed in Britain on a tree on the borders of
Saham wood, Norfolk, in 1799* but could discover no shields.
The Rev. G. R. Leathes has since found in the Earl of Bristol’s
park near Bury the specimen ip our plate with a few shields ;
these however are not in such absolute perfection but that Mr.
Sowerby has found it expedient to subjoin one of foreign
growth. In Germany, France, Switzerland, and even Sweden,
this species is far from rare, but, strange to tell ! has been
taken for L . olivaceus. Necker long ago described it by the
name of Acetabulum, indolently taken from the synonym of
Dillenius, but too faulty in its application and construction to
be tolerated. That of corrugatus expresses the essential character
of the singularly wrinkled backs of the shields.
It is one of the larger imbricated Lichens, spreading in
broadish patches, and known by its very dark green colour,
approaching to that of the gelatinous tribe. When dry it is
most glaucous. The shields are concave, rugged, red-brown,
often half an inch broad; their outside coloured like the crust
but lighter, more or less wrinkled; their margin indexed, thin,
notched, rugged, and often mealy.