The general resemblance of this species to Lecidea pul-
verea has been already noticed. It is liable to be mistaken
also for JLecanora Turneri, t. 857, and for the white variety
of L . Hcematomma, t. 486, which Acharius has called
L . Stonei: but the thallus has not the peculiar fibrous
edges remarkable in those Lichens, and is otherwise different
from both in structure, and no three Lichens are more
decidedly distinguished by their scutellae. In respect of
these, L . farmaria resembles some varieties of L . subfusca
and L . angulosa.—W. B.
