The English flora - SeaweedAfrica

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]96 LICHENES. [Squamaria.
white smooth with large brownish central radiated fleshy warts,
apothecia concave rose-coloured with a thick elevated entire
border Lecanora gelida, Ach. Syn. p. 186. Lichen gelidus,
Linn.—Dicks.— E. Bot. t. 699.
On rocks in the north of England, particularly in Teesdale, and
Highlands of Scotland.
14. S. lanuginosa, {powdery Squamaria); thallus orbicular
yellowish-white pulverulent greyish-black and downy beneath
lobes imbricated plane rounded slightly crenated, apothecia
reddish (of the same colour as the crust, Dicks.) their border
pulverulent. Parmelia lanuginosa, Ach. Syn. p. 201. Hooh,
Fl. Scot. P. II. p. 53. Lichen membranaceus, Dicks. Cr. Fasc.
2. p. 21. t.Q.f. 1.
On rocks, in the Highlands of Scotland; not very uncommon. Appin,
Capt. Carmichael.
15. S. dementi, (Clementine Squamaria); thallus adnate very
mealy with a membranous radiating lobed and finely cut margin
of a whitish unchangeable grey, apothecia bluish-black with an
inflexed crenate border. Sm—Parmelia dementi, Turn, in
P. Clementiana, Ach. Syn.
Linn. Trans, v. 9. p. 146. t. 13./. 1.
p. 201.—Lichen dementi, E. Bot. t. 1779.
On trees and tiled roofs in Sussex, as well as about Tunbridge Wells
and Southampton, Mr. Borrer.
16. S. ccesia, (grey-warted Squamaria); thallus orbicular convex
lobed and imbricated greyish-white its segments unequally
notched bearing powdery grey warts in the centre, apothecia
small glaucous-black concave with an elevated rather thick inflexed
border. Psora ccesia, Hoffm—Parmelia c&sia, Ach.
Syn. p. 216. Lichen ca>sius, Ach. Prodr.—E. Bot. t. 1052.
On walls, stones, and roofs of houses, in England.
17. S. affinis, {spongy Squamaria); thallus orbicular livid
lead-colour with broad notched and cut lobes which are imbricated
beneath somewhat spongy with bluish-black dense
fibres, apothecia rusty-coloured nearly flat with a thick elevated
inflexed crenated border Lichen affinis, Dicks. Cr. Fasc. 4.
p. 24. t. 12. 6.
f. E. Bot. t. 983 Parmelia rubiginosa, Ach.
Syn. p. 201. Lichen rubiginosus, Thunb. Fl. Cap. p. 1^6?
On trees, in subalpine countries, frequent.— I have retained Mr. Dickson's
name, in preference to that of Thunberg, to which Acharius refers
it, under an idea that the African and Euuopean plant may prove
different. The species was called affinis, on account of its similarity
with Lichen (oiir Placodium) plumbeas: but however great the resemblance
may be in the thallus, their apothecia are quite different.
18. S. circindta, (circinate Squamaria); thallus adnate subcrustaceous
in the centre orbicular greyish cracked marked
with radiant marginal lobe-like furrows, apothecia central
crowded depressed blackish-brown at length angular with a
smooth border. Lecanora circinata, Ach. Syn. p. 184 Lichen
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circinatus, Ach. Prodr.—E. Bot. t. 1941.
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