J ï V
LICHEN atro-flavus.
jBlack and yellow Sto?ie Lichen.
CRYPTOGAMIA Alga.
Gen. Char. Male, scattered warts.
Female, smooth shields or tubercles, in which the
seeds are imbedded.
Spec. Char. Crust indeterminate, membranous, thin,
somewhat granulated, black. Shields numerous,
small, flattish, full-yellow, with an entire, elevated,
somewhat paler border.
Syn. Lecidea atro-flava. Turn. Tr. o f L . Soc. v. 9.
142. t. 1 1 ./ . 2.
T h IS elegant little Lichen remained undescribed till Mr.
Turner made it known in one of his excellent papers published
in the 9th vol. of the Linnsean Society’s Transactions. It
was first noticed by Mr. Borrer on the downs of Sussex,
growing on loose exposed flints, which when white serve
ereatly to set off the crust. The C J Rev. G. R. Leathes observed
the same near Bury.
Crust always black and unpolished, very thin, adhering
closely to the stone, at first forming roundish blotches,
which, according to Mr. Turner, have sometimes a fine
fibrous edge, but usually splitting into scattered indeterminate
fragments, and becoming granulated by age. The shields
are^numerous, small, of a full yellow or orange hue, flat,
somewhat concave when young; their border thick, elevated,
smooth, entire, rather paler than the disk. These shields
are so conspicuous that wc believe the plant would not have
been so long undescribed, had the crust been thought to
belong to them.
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