The English flora - SeaweedAfrica

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200 LICHENES. [Parmelia.
the preceding species are liable to be infested with a parasite, which has
been called Endocarpon parasiticum Ach. (E. Bot. t. I860.)
8. P. perforata, Ach. (perforate-shielded Parmelia); thallus
orbicular somewhat membranous glaucous-green naked deeply
lobed crenate and sinuated fringed with black hairs at the
margin black and rough beneath, apothecia red-brown at length
perforated deep and concave with an entire narrow border.
Ach. Syn. p. 198. Lichen perforates, Ach. Prodr.—E. Bot.
t. 2423 Dill. Muse. t. 20. f. 42, 43 and 44, and t. 82. /. 3.
On rocks and old trees, Wales, Sit. J. E. Smith. Sussex, not unfrequent,
Mr. Boner.—The fructification has never been found in Britain.
In America and other countries this plant is abundant, and I have lately
received copious specimens with their curious apothecia, gathered by Mr.
Drummond on the Missouri.
9. V.perldta, Ach. (pearly Parmelia); thallus orbicular glaucous
with rounded sinuated and crenate flattish lobes often bordered
with powdery tubercles black and hairy beneath,
apothecia elevated olive-coloured concave with a crenate thin
powdery inflexed border. Ach. Syn. p. 197. Lichen perlatns,
Linn.—E. Bot. t. 341.—Dill. Muse. t. 30./. 39.
Trunks of old trees and pales, not unfrequent, but very rare in fruc-
the
tification.— Sir J. E. Smith has translated perlatus by pearly -, but
word was probably intended to imply its wide-spreading habit.
10. P. laevigata, Ach. (even grey Parmelia); thallus spreading
greyish-white smooth deeply cut into many multifid lobes
and segments the ultimate ones broadly linear acute with terminal
powdery warts black and shaggy beneath, apothecia very
concave deep chestnut with an entire inflexed border. Ach.
Syn. p. 212. Lichen Icevigatus, E~ Bot. t. 1852.
On rocks, Anglesea and Caernarvonshire, Rev. H. Davies.
11. P. herbdcea, Ach. (bright-green Parmelia); thallus orbicular
membranaceous bright-green and naked above when moist
(whitish-brown when dry) lobed and crenated at the margin
whitish dow r ny and fibrous beneath, apothecia orange-brown nearly
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flat with an inflexed border. Ach. Syn. p. 298. Lichen l&tevirens,
Lightf.—Dichs.— E. Bot. t. 294.
On the trunks of trees, decayed wood, rocks and mosses, in mountainous
countries.— A large and very handsome species, often forming broad
conspicuous patches on the trunks of trees in moist subalpine regions.
12. P. tilidcea, Ach. (smooth grey Parmelia) ; thallus orbicular
membranaceous pale glaucous-grey subpruinose lobed and sinu-.
ated crenate shaggy and brownish-black beneath, apothecia
brown with an incurved entire or crenate border. Ach. Syn.
p. 299.—Lichen tiliaceus, Hoffm.—E. Bot. t. 700.
On trees, in the south of England. On rocks, Anglesea and Caernarvonshire,
Rev. H. Davies. Upon the battlements of Brodick Castle,
Isle of Arran,
13. V.olivdcea, Ach. (olive-coloured Parmelia); thallus orbicu-
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