Flotow points out th a t the apothecia, when moistened, appear
paler and transparent, owing to the pale hypothecium, surrounded by
a dark ring.
Hah. On rooks.—Distr. Rare in the Channel Islands, Wales and
central England.—B. M. Between Rozel and Boulay Bay, Je rse y ;
Lyth Hill, Shropshire.
86. L. asema Nyl. in Flora Iv. p. 356 (1872).—Thallus effuse,
thin, unequal, somewhat scattered, whitish (K —, CaCl — ).
Apothecia small, plane, often subplicate, thinly margined, black
or livid-black; hypothecium reddish or reddish-brown; paraphyses
concrete; epithecium glaucescent; spores ellipsoid
0,013-16 mm. long, 0,006-8 mm. th ic k ; hymenial gelatine
bluish then tawny-wine-coloured with iodine.—Cromb. in Journ.
Bot. xi. p. 134 (1873); Leight. Lich. FI. ed. 3, p. 275.
Closely allied to L. suhlatypea, but differs in the form of the
apothecia, the colours of the hypothecium and epithecium, the larger
spores and the reaction of the hymenial gelatine.
_ Hah. Cn arenaceous and schistose rocks in maritime districts.—
Distr. Found only very sparingly in the Channel Islands and the
S.W. Highlands of Scotland.—B. M. Barcaldine, Argyll.
87. L. leucophsea Nyl. in Flora liii. p. 35 (1870).—Thallus
indeterminate, thinnish, verrucose-areolate, the areolse more
or less convex, greyish ( K - , C a C l - ) ; hypothallns black.
Apothecia small, adnate or appressed, plane and thinly margined,
reddish-brown, dark-purplish or livid-black, within whitish, the
margin often paler, a t length excluded ; paraphyses brown or
dark-brown a t the apices; hypothecium pale ; spores ellipsoid,
0,009-14 mm. long, 0,004-8 mm. thick ; hymenial gelatine pale-
bluish, the asci tawny-wine-coloured, with iodine.—Lecanora
leucophsea Cromb. Lich. Brit. p. 51 (1870); Leight. Lich. FI.
p. 194; ed. 3, p. 178; var. conglohata Cromb. in Journ. Bot.
xi. p. 134 (1873); Leight. II. c. Biatora leucophsea Floerke ex
Koerb. Syst. Lich. Germ. p. 194 (1855). Lecanora leucophseiza
Nyl. in Flora Ivii. p. 308 (1874) ; Leight. Lich. FI. ed. 3, p. 178.
Exsicc. Cromb. n. 63.
Sometimes the thallus is more massive and scattered, with the
apothecia convex, difform and tuberoulate; it is then var. congoblata
Cromb. The apothecia are occasionally crowded together.
Hab. Cn subalpine rooks.—Distr. Plentiful where it ooours in the
hilly districts of Wales, N. England, Scotland and W. Ireland.—B. M.
Near Llyn Aran, Dolgelly, Barmouth and Aran Mawddwy, Merioneth ;
Snowdon and Carnedd Dafydd, Carnarvonshire ; High Force, Teesdale,
Yorkshire ; Black Lot, Westmoreland ; Portlethen, Kincardineshire ;
Craig Tulloch, Blair Athole, Ben Lawers, Perthshire; Achosragan
Hill, Appin, Argyll; Morrone and Craig Guie, Braemar, Aberdeenshire
; near Kylemore and near Lough Mask, Connemara, Galway.
88. L. leucophseoides Nyl. in Flora liii. p. 35 (1870).—
Thallus areolate-granulose, the areolse smooth, plane or somewhat
rounded, greyish-white (K + yellow, then orange-red) ; hypo-
thallus black, a t times limiting the thallus. Apothecia black,
or brownish-black, somewhat plane, becoming immarginate ;
hypothecium colourless ; paraphyses discrete, slender, the
epithecium umber-brown ; spores ellipsoid or oblong, 0,010-17 mm.
long ; 0,004-6 mm. thick ; hymenial gelatine and asci bluish
with iodine. The spermatia are arcuate as in L. leucophsea.
Closely allied to the preceding, but differs in the subdeterminate
thallus, the more crowded areolse, the less prominent hypotballus,
and in the thalJine reaction.
Hab. Cn rooks in upland districts.—B. M. Dolgelly, Merioneth.
89. L. discolorella Nyl. in Flora Ix. p. 459 (1877).__
Thallus effuse, thin, whitish, areolate-rimose or scattered
(K + yellow, K (CaCl, + red) ; hypotballus black. Apothecia
black, adnate or appressed, plane, becoming slightly convex and
immarginate; hypothecium p a le ; paraphyses discrete, reddish-
brown a t the apices; spores ellipsoid, 0,012-16 mm. long^
0,006-7 mm. thick.— Cromb. in Grevillea vii. p. 111. Lecanora
discolorella Leight. Lich. PL ; ed. 3, p. 176 (1879).
Somewhat similar to L. leuoophoea, but the thallus is thin and
scanty and light in colour, and the thalline reaction is different. The
apothecia are at first sight like those of some species of Lecanora,
owing to the closely surrounding whitish thallus. The spermatia are
arcuate, about 0,020 mm. long and excessively slender.
Hab. Cn rocks.—B. M. Near Penzance, Cornwall (the only
locality).
90. L. viridiatra Schær. Enum. p. 108 (1850).—Thallus
greenish- or dull-yellow, indeterminate, thickish, areolate-diffract,
the areolæ plane or convex, subcontiguous or scattered (Kf +
yellowish, CaCl — , medulla I — ) ; hypotballus black, distinct.
Apothecia small, appressed, plane and thinly margined, a t length
somewhat convex and immarginate, blackish, hypothecium colourless
; paraphyses coherent, dark a t the apices; spores ellipsoid,
0,012-15 mm. long, 0,005—6 mm. thick ; hymenial gelatine bluish
then sordid, the asci wine-reddish, with iodine.—L. luteoatra Nyl.
in Flora Ivi. p. 299 (1873) ; Cromb. in Journ. Bot. xiii. p. 141
(1875) ; Leight. Lich. PI. ; ed. 3, p. 293. Biatora viridiatra
Stenh. Sched. Crit. xiv. p. 8 (1833).
From its general appearance might readily be taken for a Lecanora
allied to L. polytropa. In our specimens, the areolæ are rather
scattered, with the hypotballus very visible between them. The
apothecia, sparingly present in these, are at times 1-2 innate in each
areola.
Hab. On quartzose boulders in a mountainous region.—B. M.
Morrone, Braemar, Aberdeenshire (the only locality).
91. L. endomelæna Leight. in Trans. Linn. Soc. ser. 2, i.
p. 239 (1880).—Thallus pale-greyish-green, opaque, granular, the