CRYPTOGAMIA. ALGiE. Lichen. 55 
of Dickson, and L. deustus of Hudson are the same plant, and neither of 
them other than the L. torrefactus of Lightfoot, consisting of one leaf 
Mr. Griffith. 
(Corroded Lichen. L . erosus. Achar. Prod. Gyrophora erosa. Achar. 
Method. E. Bot. E.) L.polyrrhizos. Huds. Found in the same places 
with L. corneus. Dill. On rocks and stones. On St. Vincent’s rocks, near 
Bristol. Huds. About Llanberris. Mr. Davies in FI. Angl. On the 
Highland Rocks frequent. Lightf. On rocks in the mountainous parts 
of Dartmoor, Devonshire, rare. Mr. Newberry. (On rocks near Hun- 
tersley Peak, North of West Crow Park, Durham; also upon Cronldey, 
Yorkshire. Mr. Winch. E.) P. Jan.—Dec. 
L. deus'tus. Tubercles black; foliage grey brown, smooth on both 
sides. 
(E. Bot. 2483. E.) — Vaill. 21. 14 — Jacq. Coll. iii. 1. 3. 
So brittle, that unless when moist, it cannot be separated from the rocks 
without being torn. Linn. 
Dr. Smith thinks that the plant of Dillenius, 30. 117, is L.polyrrhizos , 
and that Vaillant’s figure represents the true L. deustus of Linnaeus. 
See Smith’s Tour, i. 104, but read Dill. tab. 30, instead of 20. It seems 
to be very like the less tiled and leafy specimens of the L. miniatus , 
except in the colour of the tubercles. Mr. Griffith is of opinion that the 
L. deustus and L. prohoscideus are the same plant, the former with a 
single leaf, the latter either single or complicated, and has favoured me 
with the sight of an instructive series of specimens which seem fully to 
support this idea. See his observations under L. torrefactus. 
(Burnt Lichen. Gyrophora deusta. E. Bot. G. prohoscidea. Achar. 
Hook. On rocks in the Highlands of Scotland. E.) 
L. anh'hra'cinus. Foliage black brown, smooth on both surfaces ; edge 
lobed, rounded. 
Jacq. Misc. ii. 9. 4. 
Boot single: central. Foliage leather-like, but thin and silky; brown 
black, naked and smooth on both surfaces; in shape like a lettuce; 
towards the edge plaited and curled. Wulfenin Jacq. Misc. 
(Lettuce-shaped Rock Lichen. E.) On rocks in Scotland. Dicks, iii. 19. 
L. dille'nii. Tubercles black, small; foliage ash-coloured, bluntly 
lobed, soft, pliable, thick, underneath brown black, roughish. 
Bill. 30. 117. 
Root single, short, like stone. Leaf circular, one to one and a half inch 
diameter, bluntly lobed, leather-like, thick, pliable, soft to the touch on 
the upper side, neither polished nor hairy, ash-coloured; underneath more 
or less rough, and grey, brown, or blackish. Tubercles small, black, a 
little raised above the leaf. Dill. This had been considered the same as 
the L. deustus of Linnaeus, but that species is brittle and smooth on both 
sides. 
(Leathery Ash-coloured Lichen. E.) St. Vincent’s Rocks near Bris¬ 
tol. Dare, in Dill. About Llanberris. Mr. Davies. P. Jan.—Dec. 
L. polyrrhVzos. Tubercles black, numerous; foliage grey, consisting 
of several leaves with an even surface on both sides, but with 
numerous black fibres underneath. 
Hoffm. Lich. 2. 3 . and 4—( E. Bot. 931. E .)—Hall. Enum. 2. 4. at p. 91; 
Hist. 47. 4. at iii. p. 88*— Bill. 30.130. and 82. 5. a very large plant .— FI, 
Ban, 597.1. b ^ 
