LICHEN limbatus.
Mealy-bordered leafy Lichen.
CRYPTOGAMIA Alga.
G en. C har. Male, fcattered warts.
Female, fmooth fhields or tubercles, in which the
feeds are imbedded.
S p ec . Char . Membranous, fpreading, roundly lobed,
glaucous brown, fmooth ; grey and powdery
towards the margin : beneath downy, with white
pits. Shields brown.
S yn. Lichenoidis, D ill. Mufc. 198. t. 26. ƒ. 100,
varietas farinofa, B, C.
" \ V e have long ago obferved this Lichen,. at the roots of
trees, and on fhady mofly rocks at the Hermitage near
Edinburgh, as well as growing with L.fuliginofus at Hafod,
and are convinced of its being difiinCt from that fpecies,
which Dillenius (who gathered the fame in Bagley wood,
Oxfordfhire) feems alfo inclined to fufpedt. The fructification
was found by Mr. Menzies in Scotland, and by Mr. D. Turner
upon Snowdon. Neither we nor Dillenius could ever dif-
cover it.
In form this refembles the preceding, but differs a little in
colour, being of d glaucous brown. The chief difference con-
fifts in the furface being deftitute of rough granulated warts,
and on the- contrary quite fmooth and polifhed, except towards
the margin, which is profufely covered with grey or pale lead-
coloured mealinefs, produced from cracks in the cuticle, and
not at all of the nature of a parafitical ByJJus, as Dillenius
fuppofes; neither can this be the male, or “ powder-bearing
plant” of the former, for it has proper fhields of its own,
though rarely produced, which differ from thofe of L .fu lig inofus
in having a broad bafe, or rather being imbedded in
the frond, which riling around them forms a flightly elevated
border, that Hopes off into the common level of the furface,
f nd is not contracted into any thing like a footftalk. The
under fide of the frond is like the laft.
I I 04
D e c ll 1 8OlJPuilf'hedly f a fSawerby London.