LECANORA. | LECANO-LECIDEEI. 369 
sromb. Lich. Brit. p. 48; Leight. Lich. Fl. p. 181, ed. 3, p. 167.— 
Parmelia vitellina 3. corruscans Ach. Meth. (1803) p. 177.—Brit. 
Exs.: Larb. Lich. Hb. nos. 214, 297, 298; Bohl. n. 78. 
The thallus forms a thinnish, continuous or subdiffract crust, and 
generally spreads somewhat extensively over the substratum. In its 
more typical state, with the thalline granules and those of the margin of 
the apothecia distinctly crenate, it is var. corruscans Ach. Lich. Univ. 
p- 149 (vide Nyl. Lich. Scand. p. 141). When growing on maritime 
rocks, both the thallus and apothecia at times give an abnormally 
brownish-red reaction with K, the result probably of being suffused with 
salt water. The apothecia are numerous, generally crowded and then at 
times anguloso-diffurm, yellow suffused, and often yellow-olivaceous, 
Hab. On rocks, walls, and on the earth in their crevices, also on trees 
and old pales in maritime, lowland and upland situations.—Distr. Gene- 
ral and common in most parts of Great Britain, the Channel Islands, and 
no doubt also of Ireland.—B. M.: Rozel, Island of Jersey; Islands of 
Guernsey and Sark. Near Cromer, Norfolk; Yarmouth, Suffolk; Wal- 
thamstow, Essex; Dartmoor, Devonshire; St. Minver, Cornwall; Ma- 
dingley, Cambridgeshire; near Buxton, Derbyshire; Malvern Hills, 
Worcestershire; Longmynd, Shropshire ; Barmouth, Merionethshire ; 
Island of Anglesea; near Ayton, Cleveland, Yorkshire; Alston, Cumber- 
land; Staveley, near Kendal, Westmoreland ; Stockstield, Northumber- 
land. Craigleith, near Edinburgh ; Appin, Argyleshire; Killin and 
Blair Athole, Perthshire; Will’s Braes, Bostarshive: Portlethen, Kin- 
cardineshire; Rothiemurchus, Inverness-shire. Near Belfast, co. Antrim ; 
Kylemore Lake, Connemara, co. Galway. 
Var. 6. aurella Ach. Lich. Univ. (1810) p. 177.—Thallus with 
the granules scattered, often subevanescent. Apothecia minute, the 
thalline margin entire or at length excluded.—Cromb. Lich. Brit. 
p. 48; Leight. Lich. Fl. p. 181, ed. 3, p. 167.—Verrucaria aurella 
Hoffm. Deutsch. FI. ii. (1791) p. 197. 
Differs from the type, with which it may be confluent, in the less 
contiguous, more or less obliterated thallus, and in the much smaller 
apothecia which frequently become biatoroid. 
Hab. On rocks and walls in maritime and upland tracts.—Distr. 
Apparently local in the Channel Islands, the 8.W. Highlands, and the 
S. Grampians, Scotland.—B. M.: Chateau Point, Island of Sark. Achro- 
sagan Hill, Appin, Argyleshire ; Killin, Perthshire. 
Subsp. L. xanthostigma Nyl. Not. Sallsk. pro F. & Fl. Fenn. 
Forh. v. (1866) p. 130.—Thallus effuse, thin, subleprose. Apothe- - 
cia small.—Cromb. Grevillea, xviii. p. 45.—Lecanora xanthostigma 
Cromb. Journ. Bot. 1832, p. 273. L. cttrina . wanthostigma Ach. 
Lich, Univ. (1810) p. 403. Lichen cttrinus Eng. Bot. t. 1793 upper 
fig. 
Characterized by the thinner, more leprose thallus, which at times is 
somewhat scattered. Nylander observes J. c. that it may be a distinct 
species. In the fertile British specimens the apothecia are numerous, at 
length convex, with the thalline margin obliterated. 2 
B 
