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LICHEN stygius.
Stygian Lichen.
CRYPTOGAMIA Algae.
G en. Ch ar . Male, scattered warts.
Female, smooth shields or tubercles, in which the
seeds are imbedded.
Spec. Ch a r . Imbricated; its segments linear, zigzag,
many-cleft and somewhat palmate, solid, convex on
both sides, of a shining pitchy black, with white
warts; and with black radicles beneath. Shields
of the same hue, with a thin crenate border.
Syn. Lichen stygius. Linn. Sp. PI. 1610. FI. Suec. 411,
.Ach. Prod. 109. Dicks. Crypt,fasc. 3.16. H.Sicc,
fasc. 2. 25. With. v. 4. 30. Hull, 293.
Squamaria stygia. Hoffm. PI. Lich. 'v, 2, 3. t, 25. ƒ. 1.
Parmelia stygia. Ach. Meth. 203.
E received this many years ago from the Highlands of
Scotland by favour of the Rev. Dr. Stuart, and Mr. Dickson
has found it in the same country, growing on elevated exposed
rocks.
It has been thought not easily distinguishable from L.fah-
lunensis, t. 653, with which it agrees in forming entangled
tufts, of a pitchy black, occasionally tinged with olive ; but it
differs essentially in being convex on both sides, of a considerable
thickness, white and solid internally, and smooth-
edged. The extremities are lobed or palmate, rather paler
than the other part. Under side very black, producing
numerous scattered radicles. Several minute white mealy
specks, like cracks, are found here and there on the upper
surface. Shields few, of the colour of the leaf, with a thin,
crgnate, or somewhat beaded, border,