LEC1DEA Salweii.
Salwey’s Lecidea.
CRYPTOGAMIA Lichenes.
Gen. Char. Patellulce sessile, more or less immersed,
with a margin of a substance different from the
thallus.
S pec. Char. Thallus of small, white, depressed,
bluntly-lobed, tumid, tartareous scales. Palel-
lulae superficial, slightly raised, lurid-brown ;
margin paler, narrow, flexuose; substratum
thick, pale.
O n e of the new Lichens, as we believe them, which
have rewarded the accurate researches of the Rev. Thomas
Salwey, of Oswestry, who first observed it about the
year 1825, in the Breiddin Mountain, Montgomeryshire,
and subsequently near Drws y Nant-Isaf (fig. 2.), by the
road from Bala to Dolgelly, and above Gelli-rhudd, near
Barmouth (fig. 1.). It has been gathered in Priest-Leap
Mountain, near Dunkerron, Ireland, by Dr. Taylor; near
Sennen, Cornwall, by Mr. Ralfs ; and above Twll-du,
North Wales, and in the Valley of Rocks at Linton, North
Devon (fig. 3.), by the present writer, who has much pleasure
in naming it after his highly respected friend, its first
discoverer. It grows on the ground, in rocky situations.
Patches of irregular outline and considerable extent,
composed of scales rarely a quarter of an inch over, in some
parts loosely scattered on the soil or decaying mosses*, in
others crowded into an uneven continuous crust. They are
* In the Irish and in two at least of the Welsh stations, on A n d r c c a .