Lecidea saxorum Hepp Plecht. Eur. n. 752 (1867) ; Leight. Lich.
El. p. 302 ; ed. 3, p. 314.
Differs from B. leptocline in the very marked limiting hypotliallus ;
from B. suhdisciforrnis in the reaction with potash.
Hai. On rocks.—Distr. Eare in the Channel Islands and N.
England.
19. B. excelsa A. L. Sm.'—Thallus white, thin, effuse, areolate-
cracked, the areolæ plane and flat, somewhat shining, a t times
scattered or almost obsolete (Kf + yellow, CaCIf + yellow).
Apothecia black or violet-black, small, innate, plane or somewhat
concave, margin thickish, prominent ; hypothecium blackish-
brown ; paraphyses indistinct, blackish-brown and thicker a t the
apices; spores dark-brown, oblong, 0,015 mm. long, 0,007 mm.
thick.—Lecidea excelsa Leight. in Grevillea iv. p. 78 (1876) &
Lich. FI. ed. 3, p. 323.
Hah. On mica-schist rocks.--E. M. Smmuit of the Doughruagh
Mt., Connemara, Galway.
20. B. leptocline Koerb. Syst. Lich. Germ. p. 225 (1855)
(excl. syn. B. saxorum).—Thallus whitish or greyish-white,
warted- or cracked-areolate ; hypotliallus indistinct. Apothecia
sessile or adnate, plane or liecoming convex, the margin prominent
then excluded ; hypothecium blackish-brown ; paraphyses
coherent, dark-brown a t the capitate tips ; spores ellipsoid,
blackish-brown, 0,012-16 mm. long, 0,006-9 mm. thick ; hymenial
gelatine deep-blue with iodine.—Lecidea leptocline Elot. in Bot.
Zeit. viii. p. 555 (1850).
Var. Mougeotii Th. Fr. Lich. Scand. p. 598 (1874).—Thallus
whitish, granular-dispersed or evanescent. Apothecia prominent,
small, black, not pruinose; spores 0,011-16 mm, long, 0,006-8
mm. thick.—LccZde« Mougeotii Hepp Elecht. Eur. n. 311 (1857).
L. hjpopodioides Nyl. in Flora 1. p. 372 (1867).
Hab. On rooks in mountainous regions.—E. M. Craig Tulloch,
Blair Athole, Perthshire.
Var. gevrensis Th. Fr. I. c.—Apothecia often angular and
crenate, more or less covered ivith an æruginous, green powder,
the margin black, naked, otherwise as in the species.—Buellia
gevrensis Th. Pr. in Bot. Not. 1865, p. 111. Lecidea gevrensis
Cromb. var. prolata Nyl. ex Cromb. in Grevillea i. p. 173 (1873).
Specimen not seen.
Hab. On rocks. Found by Crombie on Cairn Gowar, Blair Athole,
Perthshire.
21. B. leptoclinoides Steiner in Verb. K. K. Zool.-Bot. Ges.
Wien Ivii. p. 357 (1907).—Thallus thin, greyish, cracked-areolate,
the areolæ plane or slightly turgid (K + yellow, CaCl - ). Apothecia
black, concave then plane, with a thickish margin ; hypothecium
reddish-brown ; parap>hyses slender, lax, faintly septate,
brown a t the capitate tips ; spores always 8 in the ascus, ellipsoid
or ovoid, straight or curved, 0,010-15 mm. long, 0,006-9 mm.
thick.— Lecidea leptoclinoides Nyl. in Bull. Soc. Linn. Norm. ser.
2, vi. p. 311 (1872). Specimen not seen.
Hab. On rooks.—Distr. Eare in the Channel Islands (Jersey, collected
by Larbalestier,/dfi Steiner).
22. B. stellulata Mudd Man. p. 216.—Thallus suborbicular,
thin, minutely cracked-areolate, the areolæ plane, smooth, white
or greyish-white (K + yellow, C aC l- , medulla I - ) ; hypotballus
thin, black. Apothecia minute, subinnate, crowded, plane, black,
margined, the margin thin, entire ; hypothecium brownish-black ;
paraphyses coherent, brownish-black a t the apices ; spores ellipsoid,
0,009-12 mm. long, 0,004-5 mm. th ick ; hymenial gelatine bluish
with iodine.— Lecidea stellulata Tayl. in Mackay FI. Hib. ii. p.
118 (1836); Carroll in Nat. Hist. Rev. 1859, p. 528 ; Cromb.
Lich. Brit. p. 8 6 ; Leight. Lich. FL p. 304; ed. 3, p. 316.
Exsicc. Leight. n. 276 ; Larb. Cæsar. n. 38 & Lich. Hb. n. 311.
In a less developed condition the thallus, as noticed by Taylor,
occurs in small patches usually less than an inch in diameter ; but
these afterwards become confluent, the thallus eventually attaining a
diameter of 4 inches or more. The areolæ, aggregate in the perfect
plant, are at times somewhat scattered (form dispersa Leight. Lich.
FI. ed. 3, p. 816). The numerous apothecia are crowded, and here
and there confluent (form confluens Leight. I. c.), when the margin is
obliterated.
Hab. On rocks and stones in maritime, rarely in mountainous
districts.—Distr. Not unfrequent in the Channel Islands, S. and W.
England, S. and N.E. Ireland ; very rare in the S.W. Highlands of
Scotland.—B .M . Portelet Bay and La Moye, Jersey; Coho Bay,
Guernsey ; Sark ; Alderney ; Lydd Beach, Kent ; Hastings, Aldrington
Beach and near Brighton, Sussex ; Shanldin, I. of Wight ; Whitesand
Bay, St. Merryn and Kynezal Cliff, near Penzance, Cornwall; Torquay,
Devon; Fort Hill, Fishguard, Pembrokeshire; Dolgelly and
Barmouth, Merioneth ; Gimlet Eock, Pwllheli and Borth, Cardiganshire
; Capel Curig, Carnarvonshire ; Barcaldine, Argyll ; near
Ardglass, Down ; Kinsale, Cork ; Killarney, Kerry ; Carrigogunnel,
Limerick.
23. B. impressula A. L. Sm.—Thallus whitish-grey, thin,
filmy, areolate (K + yellow then red), limited by the black hypo-
thallus. Apothecia black, minute, numerous and crowded into
small groups of three or more, impressed in the thallus, each
apothecium circumcissed so as to appear surrounded by a thin
thalline margin ; hypothecium thin, blackish-brown ; paraphyses
indistinct, the hymenium tinged with brown ; spores roundish-
oblong, more or less- constricted in the middle, brown, 0,014-15
mm. long, 0,009 mm. thick ; hymenial gelatine dull-blue with
iodine.—LecZdea impressula Leight. in Trans. Linn. Soc. ser. 2,