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L I C H E N Borreri.
liorrerian Lichen.
CRYPTOGAMIA Algae.
Gen. Char. Male, scattered warts.
Female, smooth shields or tubercles, in which the
seeds are imbedded.
Spec. Char. Leafy, slightly imbricated, tawny grey,
even, sprinkled with white powdery warts; its segments
sinuated, rounded at the en d s: brown and
fibrous beneath. Shields bright chesnut.
Syn. Parmelia Borreri. Turn. MSS.
T h is has certainly been overlooked by all botanists Fof
L . saxatilis, t. 603, till Mr. W. Borrer distinguished it, whom
Mr. Turner has justly commemodlld in its name. Those
great cryptogamists Professors Acharius and Swartz having
•allowed it to be a distinct species, we cannot refuse oiir assent.
L . Borreri is observed by its first discoverer to be not uncommon
on the trunks of trees, especially fruit-trees, in
Sussex. It is also met with on stones. Mr. Turner has noticed
it about Norwich and Coltishall, nor is it, probably,
uncommon in other places; The shields are of very rare occurrence,
but these scarcely differ from those of L. saxatilis.
The frond is observed to differ from the latter, with which it
often grows intermixed, in being less deeply divided, its segments
more dilated and rounded, its under side paler and less
densely hairy, and its upper more inclined, when moist, to a
greenish yellow hue. Its essential difference, however, consists
in its want of those elevated reticulated powdery veins, and
consequent pits, always observable in the saxatilis; while, on
the contrary, it is sprinkled with innumerable round, white,
powdery warts over the surface, not seen in that species.