L. Lauren Leight. Lich. FI. ed. 3, p. 314 (1879). Catillaria
Lauren Hepp in Arn. exs. n. 353 (1867).
Exsicc. Johns, n. 337.
On the bark of trees, chiefly beech, rare.—E . M. Lyndhurst New
Forest, Hants.
28. B. lenticularis Koerb. Syst. Jrich. Germ. p. 191 (1855).
—Thallus thin, effuse or evanescent, brownish or greyish (K - ,
C aC l- ) . Apothecia small, adnate, reddish-brown or black, plane
with a prominent margin becoming convex and immarginate;
hypothecium brownish or colourless; paraphyses slender, distinct,’
brown or blackish-brown a t the capitate tips ; spores oblong, small)
0,006-11 mm. long, 0,002-4 mm. th ic k ; hymenial gelatine blue
then wine-red with iodine.—Lecidea lenticularis Ach. Syn. p. 28
(1814)?; Cromb. Lich. Brit. p. 91 pro parte (excl. syn. & subsp
■nigroclavata)] Leight. Lich. FI. p. 315; ed. 3, p. 335 (excl.
f. nigroclavata). L. umbrinella Nyl. in Flora lix. p. 309 (1876) •
Cromb. in Grevillea v. p. 27 ; Leight. Lich. FI. ed. 3, p. 327’
Zeora lenticularis Plot, in Uebers. Schles. Ges. Yaterl. Cult p 124
(1850).
Exsicc. Larb. Lich. Hb. nos. 70, 112, 314; Johns, n. 394.
Distinguished by the small size of the apothecium and its contents,
and especially by the almost globose tips of the paraphyses, the upper
part of which is coloured dark-brown, resembling those of Lecidea
nigroclavata which has been classified by several authors as a variety
of this species, but is included in Lecidea on account of the constantly
simple spores. Several varieties in addition to those recorded
have been distinguished—var. acrustacea H epp (ex Arnold in Flora xli
p. 502 (1858); Leight. Lioh. FI. ed. 3, p. 336 as form) represents a con-’
dition with evanescent th a llu s ; var. vulgaris Koerb. (Par. Lioh. p. 144
(I860) ; Leight. I. c. p. 835 as form) as understood by Leighton differs
from the type in including only those with a distinct th a llu s; f. oxydata
Leight. ((. c. p. 336) has a ferruginous-ochraceous thallus, and is
probably identical with var. erubescens.
Hab. On rooks in maritime and upland districts.—E7sZr Not
unfrequent throughout the British Isles.—E. M. La Moye J e r s e y
Anstey’s Cove, Torquay,_ Devon; Bathampton Downs, Somerset;
Beaohy Head, Sussex; Bisley and near Cirencester, Gloucestershire •
L la n y n g n ^ h Hill, Shropshire; Bangor and Snowdon, Carnarvon-
shire; St. Bees, Cumberland; Lismore, Argyll; Craig Guie, Braemar,
Aberdeenshire; near Cork Harbour; Blaokwater Bridge and Dinish
Fylemore Lake and Lettermore, Connemara
and Tully, Galway.
Form nigricans Arnold in Flora xliii. p. 74 (1860).~Thallus
blackish, thin, furfuraceous, areolate, plane. Apothecia slightly
larger th an in the type, hlack.— Lecidea lenticularis f. nigricans
Leight. Lich. FI. ed. 3, p. 336.
The form rimoso-areolata (Leight. I. c.) agrees with this in the
dark areoHte thallus and blackish apothecia. In Larbalestier’s
specimen the thallus is very much broken up and located in the
crevices of the rook, and is a slightly thicker state of f. nigricans
Hah. On rooks.—Distr. W. England, Wales and W. Ireland, rare.
—E. M. Bathampton Downs, Somerset; near Towyn, Merioneth ;
near Cirencester, Gloucestershire; Benvoyle, Connemara, Galway
(f. rimoso-areolata).
Var. erubescens Koerb. I. c.—Thallus thin, effuse, forming
white, yellowish or reddish patches. Apothecia innate then
adnate, small, dark when dry, reddish-black or brownish when
wet, with a blackish margin.—Zeora lenticularis var. erubescens
Flot. I. c. Lecidea lenticularis f. rliyparocarpa Nyl. ex Leight.
Lich. PI. ed. 3, p. 336 (1879).
Hab. On rocks in maritime and upland districts.—Distr. Eare in
S. and N. England, the Scottish Grampians and W. Ireland.—E. M.
Launceston, Cornwall; Bilsdale, Yorkshire; Craig Tulloch, Blair
Athole, Perthshire ; Kenmare, Kerry, Kylemore, Connemara, Galway.
Var. chloropoliza A. L. Sm.^—Thallus thin, greyish-green,
unequal or wrinkled or almost evanescent. Apothecia often
somewhat larger.—Lecidea lenticularis subsp. chloropoliza Nyl. in
Bull. Soc. Bot. Fr. viii. p. 758 (1861); Cromb. Lich. Brit. p. 91 ;
var. chloropoliza Leight. Lich. FI. p. 316 ; ed. 3, p. 336.
Exsicc. Larb. Lich. Hb. n. 313.
Characterized by the usually more developed thallus and larger
apothecia.
Hah. On granitic and schistose rooks, very rarely erratic on dead
wood in maritime districts.—Distr. Only sparmgly in the Channel
Islands, N.E. Scotland and W. Ireland.—E. M. Sark; Boulay Bay
and near St. Aubin’s (lignicolous), Jersey; Portlethen and Cove,
Kincardineshire; Killree, Clare.
29. B. rhypodiza A. L. Sm.—Thallus indeterminate, thin or
very thin, subgranulate, brownish-black. Apothecia small, plane,
thinly margined, blackish; paraphyses ra th e r thick, brown a t
the thickened clavate apices; perithecium brown ; hypothecium
colourless; spores oblong, 0,014-16 mm. long, 0,005-6 mm.
thick ; hymenial gelatine bluish then wine-reddish with iodine.—
Lecidea rhypodiza Nyl. in Flora Ixiv. p. 5 (1881); Cromb. in
Grevillea x. p. 23.
Resembles in outward appearance f. nigricans oi the preceding
species, but differs in the form of the paraphyses and larger spores.
Spermogones have not been seen.
Hah. On a schistose rook in an alpine situation.—E. M. Summit
of Craig Calliach, Perthshire (the only locality).
30. B. chalyheia Mudd Man. p. 180 (1861).—Thallus subeffuse,
thin, continuous or minutely rimulose, dark-grey or
leaden-black (K —, CaCl —, medulla I—) ; hypotballus very thin,
black. Apothecia small, sessile, plane or slightly convex,
margined, black, the margin thin, e n tire ; hypothecium thickish,
brownish-black ; paraphyses thickish, black a t the clavate apices ;
spores oblong, ellipsoid, thinly 1-septate, minute, 0,007-0,010 mm.