Physoia stellaris var. aipolia f. anthelina N}4. Lich. Soand. p. 111.
Lichen anthelinu} Ach. Prodr. (1798) p. 111.
The narrower and more discrete laciniæ, which are either entirely
smooth or somewhat rugose, distiuguish this variety. In what Acharius
subsequently (Lich. TJuiv. p. 478) regarded as the more typical state, tbe
laciuiæ are c mtinuous from the centre to the circumference, when it is
entirely analogous to var. amjustata of P. pulverulenta. In the lew B ritish
specimen 3 the apothecia are numerous.
Hah. Ou the trunks and brandies of trees iu maritime and upland
districts.—Histr. Only sparingly in S. England and S.AV. Ireland.—
B. .M. ; Ilenheld, Sussex; uear Ryde, Isle of Wight ; llsham Valley,
near Torquay, Devonshire. Muckruss Demesne, Killarney, co. Kerry.
Var. y. c e rc id ia Nyl. ex Lamy, Bull. Soo. Bot. t. xxv. (1878)
p. 384.—Thallus whitish or greyish-whito, somowhat rugose, beu
e ath with blackish rhizinæ ; laciniæ contiguous, somewhat convex,
short, ditform and crowded in the centre, piano aud broader a t the
cirouuiforoiioo. Apotheoia moderate or somewhat large, plane, tho
th allin e margin a t length crenulate.—Cromb. Grevillea, xv. p. 78.-—
Parmelia aipiolia ¡3. cercidia Ach. Lich. Univ. (1810) p. 478. Physcia
stellaris Cromb. Lich. Brit. p. 39 (cxol. var. acrita) ; Loight. Lioh.
EL p. 151, od. 3, p. 140. Borrera stellaris Aludd, Alan. p. 109.
Parmelia stellaris Tayl. in Alack. Fl. Hib. ii. p. 142. Lichen stellaris
Lightf. Fl. Scot. ii. p. 824 ; AVith. Arr. iv. p. 31 pro parto ; Eng.
Bot. 1 .1697.— B rit. Exs. \ Leight. n. 6 ; Aludd, n. 79 ; Larb. Lich.
Hb. no. 161.
A larger and coarser plant with somewhat of the aspect of P. pmlveru-
Imta. I t differs from the type in the colour of the rhizinæ and in the
more contiguous, convex, and rugose laoiniæ, which are at times as if
iinbricato-squamose in the centre. The apothecia are often very numerous
and crowded, sometimes nearly obliterating the thaUus, when they
become flexuose and deformed.
Hab. On the trunks of old trees, very rarely on calcareous walls, in
cultivated tracts from maritime to upland districts.—Distr. General and
plentiful in most parts of Great Britain ; apparently rare in S. Ireland
and in the Channel Islands.—B. AI. : Island of Guernsey. Yarmouth,
Norfolk; AValthamstow, Essex; Edgeware, Aliddlesex; near Elstree,
Herts ; Reigate, Surrey ; Glynde, near Hastings, and Henfield, Sussex ;
near Ryde, Isle of AA'ight ; AA’itliiel and Penzance, Cornwall ; uear Nails-
worth, Gloucestershire ; Aladingley Park, Cambridgeshire ; Twycross,
Leicestershire; Pixham, near AV orcester, and North Alalvern, AVorcester-
shire ; Harboro’ Alagna, AVarwickshire ; Llandrindod, Radnorshire ; Aberdovey,
Alerionethshire ; Clungunford and near Shrewsbury, Shropshire ;
near Ayton, Cleveland, Yorkshire ; Kendal and AA'indermere, AVestmoreland
; Alston, Cumberland ; near Hexham, Northumberland. Troquain,
New Galloway, Kirkcudbrightshire; near Alelrose, Roxburgh; near
Edinburgh ; Inverary Castle, Argyleshire ; Blair Drummond, near Stirling;
Finlarig, Killin, Perthshire; Camperdown, Forfarshire; Cults,
near Aberdeen, and Castleton of Braemar, Aberdeenshire ; Fort AVilliam,
Inverness-shire ; Applecross, Eoss-shire. Near Cork ; Dunkerron, co.
Kerry.
15. P. melops Duf. (sub Parmelia) ex Nyl. Flora, 1874, p. 16.—
Thallus orbicular, stellari-appressed, multifido-laoiniate, more or loss
cæsio-greyish ; laciniæ narrow, contiguous, convex (K]|]yollow,
C aC l/) . Apotheoia small, plane, th e thalline margin entire or a t
len g th slightly crenulate ; sporos as in th e preceding species.—-
Cromb. Journ. Bot. 1885, p. 195.
Closely allied to P. aipolia, from which it difiers chiefly in the darker
cæsious thaUus. Cur single British specimen is sterile, with the thaUus
not weU developed. According to Nylander I. c. it is a widely distributed
saxicolous plant iu the mountainous regions of Europe.
Hab. Cu a calcareous -wall among dead mosses in a maritime mountainous
district.—Distr. Seen only in the S.AV. Highlands of Scotland ;
no doubt to be detected elsewhere.—B. AI. ; Appin, Argyleshire.
16. P . tribacia Nyl. Flora, 1874, p. 48.—Thallus orbicular or
subeffuse, moderate, shortly laciniate, glaucous-white or white,
sprinkled with small, subglobose, concolorous soredia, usually slightly
subfarinaceo-sufEused ; beneath whitish, w ith a few concolorous
fibrillose rhizinæ ; laoiuiæ crowded, imbricate, digitato-orenate at
the apices (K]?7®^^°''', C aC l/) . Apothecia moderate, scattered,
blackish, th e thalline margin subentire or suborenulate ; spores
oblong, 0 0 1 5 -2 0 mm. long, 0,0 0 8 -1 1 mm. thiok.—Cromb. Grevillea,
XV. p. 78.— Borrera cæsia p. tribacea Aludd, Alan. p. 107. Squamaria
tribacia Sm. Eng. El. v. p. 194 pro parto. Psoroma trihacium
Gray, Nat. Arr. i. p. 445. Lecanora tribacia Ach. Lioh. Univ.
(1810) p. 415.
A plant little understood by authors, allied to P. stellaris, with which
it agrees in the reactions. I t differs, however, in the thallus being
generally covered with a thin farina, in the presence of soredia, and iu
tlie more crowded laciuiæ being digitately crenate at the apices. In tlie
soredia it approaches P. cæsia, but difiers in all other essential characters.
The apothecia are not present iu the British specimens (cfr. Ach. I. c.).
Hab. Cn fruit-trees of orchards in maritime districts. —Distr. Confined
to a few localities in S. England and the Channel Islands.—B. AI. : St.
Alartin’s, Island of Jersey. Lymington, H ants ; near Penzance, Cornwall.
17. P. trihacoides Nyl. Flora, 1874, p. 307.—Thallus orbicular,
small, shortly laciniate, whitish, sprinkled w ith small, subglobose,
white soredia, sparingly subfarinaceo-suflfused ; beneath whitish,
nearly naked ; laoiniæ narrow, crowdedly imbricate, digitato-crenate
a t th e apices (K+ycUow, C aC l/) . Apotheoia no t seen rightly
developed.—Cromb. Grevillea, iii. p. 22 ; Leight. Lioh. Fl. ed. 3,
p. 140.
Subsimilar to the preceding species, from which, besides other characters,
it at ouce differs in the reaction of the medulla with K. In tfie
specimen gathered there are only two young apothecia.
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