[ 1465 ]
LICHEN claveilus.
Grey-crusted Pin-headed Lichen.
CRYPTOGAMIA Algce.
Gen. Char. Male, scattered warts.
Female, smooth shields or tubercles, in which the
seeds are imbedded.
Spec. Char. Crust rugged, cracked, greyish white.
Tubercles on black foot-stalks, spherical, flattish,
black, powdery, with a greyish black border; grey
beneath.
Syn. Lichen claveilus. Ach. Prod, 83.
Calicium claviculare. Ach. Meth. 90.
I OUND plentifully on the same barn with the preceding,
with which it is often so intermixed that their two crusts can
hardly be distinguished. That of the present however is
thicker, lobed and cracked rather than granulated. The fructification
is totally different. Little black cylindrical stalks
rise plentifully from the cracks of the crust, each bearing a
round flattish head, black and powdery above, greyish beneath,
and surrounded by a thin greyish border. A doubt has
been suggested whether the crust belongs to these heads.
From very careful examination, and the analogy of other
species of Calicium in Acharius, we believe it does. It may
be more doubtful whether our L. splicerocephalus, t. 414, be
a different species. If we are right in its crust, it is certainly
so. However this may be, having now the true L. claveilus,
compared with specimens from Acharius, and agreeing with
them in crust and fruit, we think proper to figure it, as he
says in his Methodus he could quote no certain synonym, nor
figure, for it. We can assure him, notwithstanding the deference
so justly his due, that our L. inquinans, t. 810, appears
to us always quite distinct from this.
1465
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