LICHEN Lightfootii.
Lightfootian Lichen.
CRYPTOGAMIA Algae.
Gen. Char. Male, scattered warts.
Female, smooth shields or tubercles, in which the
seeds are imbedded.
gpEC. Char. Crust tartareous, granulated, greenish,
white, black-edged. Shields sunk, flat, polished,
black, with a black smooth border: at length
convex.
T h i s grows on the bark of trees, and has been sent to Mr.
Sowerby from Sussex by Mr. W. Borrer, and to Mr. Turner
from the north of Ireland by Dr. Scott. A British specimen
was given me so long ago as the year 1784, by the late author
of the Flora Scotica, as a new Lichen, distinct from sangui-
narius as well as from that in our last plate; and as his
opinion seems not ill founded, I am happy to take this oppor-s
tunity of applying his name to the species.
I am well aware how nearly this is related to the foregoing,
and propose it rather for further inquiry than with any great
confidence. The crust forms its principal distinction, being
tartareous, and very strongly granulated; white within,
greenish, not grey, without, The shields are immersed in
the crust, and at every period of their growth overtopped by
its granulations. They are black, rather shining, not quite
opaque, somewhat concave when young, with a very thin
smooth black border; when old they become slightly convex;
and rugged.