CRYPTOGAMIA Algae.
Gen. Char. Male, scattered warts.
Female, smooth shields or tubercles, in which the
seeds are imbedded.
Spec. Char. Crust leprous, granulated, friable, lemon-
coloured. Tubercles black, globose, solitary or aggregate.
Syn. Lichen citrinellus. Ach. Prod. 64. Act. Holm,
am . 1795. 135. t. 5 . f . 5.
L . flavo-virescens. Dicks. Crypt, fasc. 3. 13. t. 8. / 9.
Lecidea citrinella. Ach. Meth. 47.
O r ig in a l l y discovered by Mr. Dickson, growing on the
ground in sandy places. The crust is well described by
Acharius in the Stockholm Transactions for 1795, as thick,
and rather deeply rooted in the earth, friable, spreading irregularly,
unequal, of the vivid greenish-yellow hue of a
scarcely npe lemon, and composed of smooth round granulations,
intermixed with some powdery particles. It is nearly
of the same hue within. The tubercles are extremely black ;
when separate, as Acharius describes them in the work just
quoted, they are small and not very evident, but in our specimens
they mostly form clusters, each resembling one tolerably
large shield, and making a rugged mass, often broken
by intervening particles of the crust.
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