the disk of the lobes, seldom numerous, at first somewhat
convex with a scarcely perceptible entire margin around
their base of the substance of the thallus, which by degrees
rises above the disk, becomes crenulate, and shoots out into
granules like those of the thallus, and among these the disk,
still but little convex, is immersed and often partially concealed.
The disk of the scutella is browner than the thallus,
tawny when dry; in which state the lobes of the thallus
are brown, and the terminal granules black with a somewhat
velvety appearance when observed with a glass.
C. ceranoides is nearly allied to C. cristatum, with the
larger varieties of which it is, in all probability, often confounded
; but it is distinguishable by the clustered fastigiate
granules, or ramuli, which compose its surface. Acharius
seems to have taken it for Lichen palmatus of Hudson ; but,
whatever Hudson’s plant may have been*, that figured by
Dillenius t. 19, f . SO, is proved by the specimen preserved
in his herbarium to be the L . palmatus of Engl. Bot. 1.1635,
with which the description in the Historia Muscorum likewise
accords. To this the (3 of Acharius, C. corniculatum
of Hoffmann, probably belongs. It is possible that the
species before us may be the Lichen tenax of Engl. Bot.
t. 2349, the original specimen of which has been sought for
in vain in the Smithian collection. We have seen neither
authentic specimensoftheZi.tewao: of Swartz, norAcharius’s
figure in the Stockholm Transactions; but the L . tenax of
Bernhardi’s paper in Schrader’s Journal, which is regarded
as the same with Swartz’s, must necessarily, from the figure,
be a different .Lichen from ours.—W. B.
* See Mr. Griffith’s opinion in Withering. We have no other ground
for doubt.