[ s t ic t a .
exotic variety, cannot be retained for our British forra.- -B r it. Exs. :
Cromb. n. 38.
Differs from the type chiefly in having the lobes more broadly dilated,
and approaches var. Canariensis Ach. I t is a very interesting British
form of an exotic lichen, which has not been found elsewhere in Europe.
Iu fertile specimens the apothecia are numerous, chiefly marginal, but
sometimes also sparingly scattered.
Hah. On shady rocks in maritime and upland districts.—Distr. Very
local, though somewhat plentiful iu S.W. Ireland.—B. AI. ; Turk Cascade,
Killarney AVoods, Cromaglown, co. Kerry ; near Baiitry, co. Cork.
Subgenus PAIIAIOSTICTA Nyl. Elora, 1875, pp. 303, 303.—
Thallus beneath with pulverulent sorediiform pseudocyphellæ ;
apothecia tru ly parmeleine (with gonidia present throughout, even
to th e extreme margin of the receptacle).
2. S. aurata Ach. Aleth. (1803) p. 277.—Thallus expanded,
opaque, or b u t slightly shining, lobato-divided, reddish-brown or
red ; beneath shortly tomentose, brownish-black in th e centre,
brownish a t th e circumference : lobes sinuato-incised, cronato-undu-
late, and generally citrino-pulverulent at th e margins. Apothecia
largo, subpedicellate when young, marginal or submarginal, dark
brown, the margin th in , usually inflexed ; spores 3-septate, fusiform,
brownish, 0 ,0 2 4 -2 8 mm. long, 0 ,0 0 7 -8 mm. thick.—Gray,
N a t. Arr. i. p. 430 ; Sm. Eug. El. v. p. 205 ; Aludd, Alan. p. 90 ;
Cromb. Lich. Brit. p. 31 ; Leight. Lich. El. p. 119, ed. 3, p. 112.—
Lichen auratus Eng. Bot. t. 2359. Lichenoides lacunosum rutilum,
marginibus fla v is Dill. AIusc. 549, t. 84. f. 12.—B r it. E xs. : Cromb.
n. 39 ; Leight. n. 261 ; Larb. Cæsar. n. 16.
The thallus with us is smooth and usually little expanded. The
pseudocyphellæ and the medullary layer are citrine. In this country
neither apothecia nor spermogones have been detected.
Ilah. On trees, rocks, and heather iu maritime localities.—Distr. Local
and scarce in S. W. England, chiefly in the Channel and Scilly Islands.
—B. AI. : Near the Eperquerie, Island of Sark ; Jerhourg, Island of
Guernsey. Near Shanlilin, Ryde, and Ventnor, Isle of Wight; coasts
of Devonshire and Cornwall ; Fresco Island aud Bryer Island, Scilly.
Form subglaucescens Cromb. Grevillea, xv. (1887) p. 76.—Thallus
pale brownish-glaucous, bright-green when moist ; otherwise as in
th e type.
Though differing merely in the peculiar colour of the thallus both in a
dry and wet condition, this must rank as a well-marked form.
Hah. On the branches of old apple-trees in maritime districts.—Distr.
Very rare in one locality of S.W. England.—B. AI. : The Undercliff,
Lyme Regis, Dorsetshire.
48. RICASOLIA De N ot. Giorn. Bot. Ita l. i. (1846) p. 178 ; Nyl.
Syn. i. (1860) p. 355.—Thallus frondoso, lobed or laciniate, very ra re ly
sorediiferous ; beueath w ith fasciculate rhizinæ, or sometimes nearly
glabrous, very rarely w ith cyphellæ ; gonidial layer composed of
gonidimia. Apotheoia parmeleine, usually scattered ; spores variously
fusiform, septate. Spermogones in mastoid prominences, with
jo in ted sterigmata ; spermatia shortly cylindrioal, somewhat thickened
and obtuse a t either apex.
Distinguished from the preceding genera of the tribe by the fasciculate
rhizinæ, the nature of the gonidia, and the situation of the spermogones.
Most of the species are natives of equinoctial regions ; of the three which
occur in Europe two are plentiful in our Islands.
1. R. am p lissim a Leight. Lich. Fl. (1871) p. 120.—Thallus orbicular,
expanded, rigid, opaque, smooth or rugose in the centre,
glomuliferous, laciniato-divided, glaucous-green or pale-brown,
laciniæ crowded, sinuato-lobed ; beneath p a le ,w ith brownish rhizinæ,
cyphellæ none CaCl ~ ) . Apotheoia large, concave, or
a t length plane, reddish, th e margin entire, infloxed or gran u la te ;
spores elongato-fusiform, (l-)3 -s e p ta te , colourless, 0 ,3 2 -6 0 mm.
long, 0 ,0 0 6 -7 mm. thiok.—Leight. Lioh. FI. ed. 3, p. 112.—Lichen
amplissimus Scop. Fl. Cam. ii. (1 7 7 2 ) p. 386. liicasolia glomu-
lifera Cromb. Lioh. Brit. p. 32. Sticta glonndifera Aludd, Alan,
p. 91. Parmelia glomulifera Gray, Nat. Arr. i. p. 436 ; Hook. Fl.
Scot. ii. p. 52 ; Sm. Eng. F l. v. p. 198. Lichen glomuliferus Lightf.
F l. Scot. ii. (1777) p. 853 ; With. A rr. ed. 3, iv. p. 57 ; Eng. Bot.
t. 293. Lichen laciniatus Huds. El. Augl. (1762) p. 449. Lichenoides
suhglaueum cumatile, fo liis teiiacibas, eleganter laciniatis Dill.
AIuso. 197, t. 26. f. 99.—Hudson’s specific name has priority, bu t
having fallen into oblivion is no t adopted.—B rit. E xs. : Leight.
n. 110 ; Larb. Cæsar. n. 6 2 ; Cromb. n. 138.
One of the largest lichens, spreading in favourable situations extensively,
and sometimes enveloping a large portion of the trunks of trees
with an unbroken covering. I t is easily recognized by the almost constant
presence of the dark-green glomeruli of Dendriscocaulon bolacinum
on the upper surface of the thallus. The apothecia are somewhat rare,
but are generally abundant when present. Occasionally they are abortive,
small and crowded, appearing as if cephalodine. The spermogone.s in
otherwise sterile plants are frequent, prominent, the ostiole brown, with
spermatia 0,005 mm. long, about 0,001 mm. thick.
Hab. On the trunks of old trees, chiefly ash aud oak, rarely on rocks in
maritime and upland districts.—Distr. Not very general, though usually
plentiful, chiefly in the western tracts of Great Britain ; rare in S.W. and
N. Ireland and in the Channel Islands.—B. AI. : Near Rozel, Island of
.lersey; Jerhourg, Island of Guernsey; Chateau Point, Island of Sark.
New Forest, Hampshire ; Alanaton Moor, Brent Tor, and Ivy Bridge,
Devonshire: Boconnoc and near Launceston, Cornwall ; Llanforda, nes r
Oswestry, Shropshire ; Hafod, Cardiganshire ; near Dolgelly, Barmouth,
Aberdovey, and Llanhedr, Alerionethshire ; Island of Anglesea ; Sedburgh
and AVindermere, VA’estmoreland ; Horsleyhope Denes, Durham ; Keswick,
Cumherland. New Galloway, Kirkcudbrightshire ; Alinto Crags,
Roxburghshire ; Alngdock Castle, near Glasgow j Loch Long, near Ros-
neath, Inverary, and Barcaldine House, Argyleshire ; Loch Katrine, Glen
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