C R Y P T O G A M I A Alga.
G en. Char. Male, fcattered warts.
Female, fmooth fhields or tubercles, in which
feeds are imbedded.
Spec. Char. Cruft gray, cracked, whitifh about the
tubercles, which are immerfed, black, prominent,
fmooth.
T h i s Lichen, for which we can meet with no fynonyms,
was difcovered by Mr. Dawfon Turner upon brick walls about
Yarmouth. It covers the furface of the bricks with a gray cruft,
fcarcely mealy, hut foil of minute angular uneven cracks.
The tubercles are numerous, very prominent, pointed, and
fmooth, particularly black in the centre, deftitute of any margin,
immerfed in the cruft, and each always occupying a con-
fiderable angular portion of it, which is whiter, both within and
without, than the reft of the cruft. Sometimes thefe portions
crowd one another into tolerably regular hexagons. When the
older tubercles are cut acrofs or rubbed down to the brick, it is
found that the cruft has been elevated along with their central
part, as in L , fanguinar'ms, tab. 15 5.
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