il!-''
Lochay, and Kenmore, Perthshire ; Clova, Forfarshire; Lochaber, Inverness
shire. Dinis Island, Killarney, co. Kerry ; Glenarm, co. Antrim.
2. R. lætevirens Leight. Lioh. Fl. (1871) p. 121.—Thallus orbicular,
expanded, scarcely rigid, smooth or rugulose, somewhat
shilling, laciniato-lobed, bright-green or pale-brown, or lurid ;
beneath tomentose, pale, the rhizinæ concolorous or white, eoyphellate
; lobes roundly crenate and undulate a t th e margins, cyphellæ
none (K ~ , C aCl^ ). Apotheoia large, scattered, reddish, the margin
granulato-rugulose, inflexed ; spores fusiform, 1 -septate, a t length
pale-brown, 0 ,0 2 6 -4 4 mm. long, 0 ,0 0 9 -1 1 mm. thiok.—Leight.
Lioh. Fl. ed. 3, p. 113.—Lichen lætevirens Lightf. Fl. Scot. ii. (1777)
p. 852 ; Eng. Bot. t. 294 ; With. Arr. ed. 3, iv. p. 58. Bicasolia
herhacea Cromb. Lioh. Brit. p. 32. Sticta herbácea Gray, Nat. Arr.
i. p. 431 ; Aludd, Alan. p. 91, t. ii. f. 27. Parmelia herhacea Hook.
El. Soot. ii. p. 52 ; Sm. Eng. F l. v. p. 200 ; Tayl. in Alack. El. Hib.
ii. p. ,141. Lichen herhaceus Huds. Fl. Angl. ed. 2 (1778) p. 544 ;
Eng. Bot. t. 294 ; AA’ith . Arr. ed. 3, iv. p. 58. Lichenoides loete-
virens, scutellis fulvis Hill. AIuso. 195, t. 25. f. 98. Lichenoides
arboreum cinereo-virens, tenue et lævs ubique, scutellis minoribus Dill,
in Ray, Syn. ed. 3, p. 73, n. 64. — Brit. Exs. : Leigbt. n. 75 ; Cromb.
n. 40 ; Dicks. Ilo rt. Sio. n. 23 ; Larb. Lioh. Hb. n. 326.
Also a widely expanded plant, though not so much as the preceding.
The thallus, which is somewhat thinly membranaceous, is of a bright
green colour, but in drying it becomes greyish-green and then lurid-
hrown. The apothecia are common, as are also the spermogones, which
are similar to those of R. amplissima.
Hab. On the trunks of old trees, and occasionally on mossy boulders,
in maritime and upland situations.—Distr. General and common in the
hilly and mountainous regions of Great Britain ; rare in AA’. Ireland and
the Channel Islands ; abundant in the S.AA’. Highlands, Scotland.—B. AI. :
Near Rozel, Island of Jersey ; Shanklin and Appuldurcomb, Isle of Wight.
New Forest, Hampshire; Ivy Bridge, South Brent, near Totnes, Beckey
Falls, and near Haherton, S. Devon ; Boconnoc and St, Alinver, Cornwall ;
Bryer Island, Scilly ; Dynevor Castle, Carmarthenshire ; Charnwood
Forest, Leicestershire ; Derbyshire ; near Dolgelly, Aberdovey, and Barmouth,
Alerionethshire ; Bettws-y-Coed, Denbighshire ; Island of Anale-
sea ; Baysdale, Cleveland, Yorkshire ; near Eglestone, Durham ; Winder-
mere and near Stockgill, AA’estmoreland ; Calder Abbey, Cumberland.
New Galloway, Kirkcudbrightshire ; Largs, Ayrshire ; near Inverary,
Barcaldine, and Appin, Argyleshire; The Trossacbs, Bracklin Falls,Glen
Lochay, and Craighall, Perthshire ; Clova, Forfarshire ; Craig Cluny,
Braemar, Aberdeenshire ; Ijochaher, Inverness-shire ; Cawdor AA’oods,
Nairn ; xVpplecross, Ross-shire. Killarney and Cromaglown, co. Kerry ;
near Kylemore, co. Galway.
11 Î'
Tribe XV. P E L T I G E R E I Nyl. Alem. Soc. Cherb. ii. (1854)
p. 13 ; Syn. i. p. 315 ; Flora, 1882, p. 457.
Tballus frondosely dilated, membranaceous, the cortical layer distin
c tly cellular, usually wanting beneath ; gonidial layer consisting
of gonidimia, or more frequentl)' of gonimia. Apotheoia peltiform,
marginal and adnate either to th e upper or the lower surface, or
innate and scattered on th e upper surface of the thallus ; spores
8næ, ra re ly 4næ or 2næ, colourless, septate and fusiform in the
marginal apotheoia, brown, ellipsoid and bilocular in th e scattered
apotbecia ; paraphyses discrete, articulate, usually thickish. Spermogones
(in so far as known) immersed in the thallus, with jointed
sterigmata.
Nylander points out the analogies of this tribe in various respects to
Stietei (Pyr. Or. p. 31 note) ; but beiug less developed, it occupies an
inferior place. The thaUus for the most part is without a cortical layer
on the lower surface, where also it is destitute of cyphellæ. I t is a small
tribe, though most of the species are widely distributed in the colder and
more temperate regions of the globe. In Nylander’s recent arrangement
it is divided into the two following subtrihes, distinguished from each
other by anatomical characters {cfr. Flora, 1884, p. 219).
Subtribe I. P E L T ID E I Nyl. Flora, 1882, p. 457, 1884, p. 219.
Thallus bearing oephalodia ; gonidial layer composed of gonidimia.
Apotheoia and spores variable as in tb e tribe.
AA’ell characterized hy the thallus being cephalodiiferous and gonidi-
miose. Of the three genera, Nephroma, Peltidea, and Solorina, the first
does not occur in Great Britain. I t is distinguished from the others by
the thallus being continuous beneath, with the apothecia adnate on its
lower surface. The cephalodia are variable in their position, being either
epigenous or hvpogenous or endogenous ; when rhizinæ are present, they
are composed of fasciculate filamentose elements.
49. PE L TID EA Ach. Aleth. (1803) p. 282 pro pa rte ; Nyl. Flora,
1866, p. 116.—Thallus fragile, th e cortical layer not continuous on
the under surface,
which is nerved and b
erhizinose. Apothe- © ©f
oia adnate ou th e
m arginal lobules of
th e upper surface of
th e thallus, ascending
or horizontal ; spores
3- or p luri-septate,
fusiform ; hymenial
gelatine bluish with
iodine. Spermogones
unknown.
A small genus distinguished
from Pelti-
yera of the following
subtrihe by the presence
of cephalodia, pig qg.
and by the nature of
the gonidia. I t con- Peltidea aphthosa Ada..—a. Section of (entire) thallus,
tains only two species, x 200. h. Gonidimia, X 350. e. Theoa and paraboth
of which occur in pliyais, x350. d. Three .spores, x500.
our I.slands.
ll