brown : internal substance white, with a little green near
the surface. Scutell® numerous, very little protuberant,
smaller than poppy-seed, circular except where crowded;
margin narrow, entire, slightly elevated in young scutellae,
subsequently depressed by the swelling of the dark brown or
blackish disk, which becomes however but moderately convex.
Those areolae on which scutellae are not yet expanded
are mostly marked with minute black dots, usually three or
four on an areola, as if from incipient fructification.
L . milvina |3. of Acharius is erroneously given in Engl.
Bot. t. 2152 as Lichen simplex, along with a specimen of the
true plant of Davies, which Acharius also was misled to regard
as the same. It scarcely belongs to the species now
before us ; yet we are not prepared to assert positively that
it does not. It may bear for the present its original trivial
name, privigna, the other Lichen confounded with it in the
Melhodus Lichenum being but a state of Opegrapha Per-
soonii.
We adopt the Acharian genus Lecanora with reluctance,
as distinguished by an unsatisfactory character from Par-
melia. Some of its species seem to require transferring to
Lecidea, if even this genus can be maintained.—W.B.
L E C A N O R A aipospila.
Loose branchy-crusted Lecanora.
CRYPTOGAMIA Lichenes.
Gen. Char. Scutellae sessile, with a margin of the
same substance as the thallus.
Spec. Char. Crust tartareous, rugged with branchlike
granulations, brownish gray ; edges plicate.
Scutellae small, terminating the granulations;
margin entire, at length depressed; disk dark
brown.
Syn. Lecanora aipospila. Ach. Lick. Univ. 385.
Syn. 155.
Parmelia aipospila. Ach. Meth. Suppl. 36.
Lichen aipospilus. Wahl. FI. Lapp. 409. t.2 1 .f . 2.
FI. Suec. 805.
CjfATHERED by Mr. W. Robertson, in 1821, at Bam-
burgh and Staples Islands, on the coast of Northumberland.
The present writer believes that he saw the same
species on maritime rocks in Orkney, in 1808, but he did
not obtain specimens.
The crust spreads widely. It is of a dull brownish or
reddish gray, sometimes partially lead-coloured, and is composed
of tartareous granulations, which are sufficiently large
to form a loose surface very uneven to the naked eye, and
most variable in figure, generally lobed and contorted,
often assuming the form of irregularly cylindrical, occasionally
subdivided, branches; towards the edges of the patch
they are less elevated, and the edges themselves are thin
and plicate, crenate or slightly lobed, bordered with some