zy [ 2050 ]
L I C H E N sinuosus,
Sinuous Imbricated Lichen.
CRYPTOGAMIA Algce.
Gen. Char. Male, scattered warts.
Female, smooth shields or tubercles, in which the
seeds are imbedded.
Spec. Char. Imbricated, radiated, membranous, smooth,
o f a sulphureous g re y ; black with dense fibres beneath
; its segments pinnatifid, with dilated cloven
lobes and circular sinuses. Shields brown, with a
thin, smooth, entire, grey border.
T h e late Mr. James Burgess Mac-Garroch, only son of the
discoverer of Lichen Btirgessii, <..300, sent us this Lichen so
long ago as August 1784, saying it was “ common on moor-
stones in Dumfriesshire,” but without fructification. We
have always thought it new, and a more extensive knowledge
of the subject, by correspondence with Dr. Acharius and
others, has but confirmed that opinion. Mr. Turner and
Mr. W. J. Hooker gathered it on old walls at Ballacheulish,
Mr. Menzies communicated a specimen of the same, on the
bark of a tree from Nova Scotia, to which we have had recourse
for the shields.
The fronds spread circularly, in a radiating form, in flat
patches several inches wide, and are thin, membranous,
smooth, even, of a very pale sulphureous grey, more or less
smoky, on the upper side, transversely cracked when old;
the under surface is clothed, with very black, dense, rigid,
branching fibres, visible beyond the edges. The lobes are
somewhat linear, pinnatifid, branched and dilated outwards,
strikingly distinguished by the roundness of their sinuses;
the ends are abrupt and cloven. Shields when present numerous*
slightly elevated, as broad as a. vetch-seed or small
pea, thin ; their disk flattish, dark-brown; their border of the
substance and colour of the frond, peculiarly thin, smooth
and even.
This species ranges near the centrifugus and conspersus of
Acharius.