t i o
[ 1893 ]
L I C H E N crassus.
Thick Lichen.
CRYPTOGAM!A Algce.
G e n . C h a r . Male, scattered warts.
Female, smooth shields or tubercles, in which the
seeds are imbedded.
S p e c . C h a r . Crust imbricated, cartilaginous, pale
green$ its lobes horizontal, rounded, divided,
notched and waved; brownish beneath. Shields
flatfish, brownish-orange, with a pale border.
Syn. Lichen crassus. Huds. 530. Ach. Prod 97
Hull. 294.
L. cartilagineus. L ig h tf 815. With. v. 4. 29. Dicks.
H. cncc.fasc. 6. 24.
L. laqueatus. Wulf._ in Jacq. Coll. v. 3. 109. t. 5tf 2.
Lichenoides cartilagineum, scutellis fulvis planis. Dill.
, Muse. 179. t, 2 4 . f . 74.
Parmelia crassa. Ach. Meth. 183. \
F ound on limestone rocks in the more hilly parts of
Britain. We gathered it in great perfection on St. Vincent’s
rocks below Bristol Hot-wells. It forms broad cushion-like
tufts or patches on the earth that covers the rocks. The frond
or crust is somewhat leafy, imbricated, brittle and friable,-
extremely white within; its upper surface smooth, of a light
or yellowish green, turning brown with age; the under side
brown, or black as if inky, rough. The lobes spread horizontally,
rather in a close entangled manner, and are rounded,
bluntly Iobed and notched, their edge palish. Shields sessile,
nearly flat, of a dull rufous orange, with a pale obtuse border.
They turn black in decay.
Wulfen erroneously quotes L.fragilis of Scopoli, which
is L. Smitkii of Acharius, Micheli, t. 5 1 . / . i, for this which
is / . 2. We must exculpate Lightfoot from having confounded
this with L. cartilagineus of Swartz and Acharius,
a plant we believe not found in Britain, and which he certainly
never saw.