LECANORA. | LECANO-LECIDEEL, 395 
furaceous on the surface. Apothecia minute, scattered; spores 
0,010-18 mm. long, 0,006-8 mm. thick.—Forma melangica Leight. 
Lich. Fl. ed. 3, p. 214. Rinodina leprosa * malangica Norm. Spec. 
loc. (1868) p. 103. 
A very distinct variety, or probably subspecies, differing in the cha- 
racters given of the thallus and apothecia. As observed by Th. M. Fries 
(Lich. Scand. p. 201), it is very dissimilar in habit to the type, but transi- 
tion-states are not wanting, 
Hab. On trunks of old trees in an upland tract.—Distr, Only sparingly 
in W. England.—B, M.; Haughmond Hill, Shropshire. ; 
Subsp. L. lavigata Nyl. ea Stiz. St. Gall. Nat. Ges. (1882) 
p. 358.—Thallus effuse, thin, scattered, or scarcely any visible. 
Apothecia rather small, usually lecideoid; spores 0,014-20 mm. 
long, 0,007-10 mm. thick.—Cromb. Grevillea, xviii. p. 46.—L. 
sophodes (3. levigata Ach. Lich. Univ. (1810) p. 857; Cromb. Lich. 
Brit. p. 49; form devigata Leight. Lich. Fl. ed. 3, p. 215. 
Characterized by the little developed thallus, the type of the smaller 
apothecia, and the thicker spores, The thallus is often evanescent when 
the apothecia at length appear as if sublecideine (var. decidetna Nyl. olim, 
in Herb. Mus. Fenn. p. 87). This is the ordinary condition of the plant 
in this country, where it does not, as elsewhere, occur corticolous. 
Hab. On rocks and walls in maritime and upland situations. —Distr. 
Only sparingly in a few localities in Great Britain and Ireland.—B. M.: 
Cirencester, Gloucestershire. Island of Lismore, Argyleshire; Craig 
Guie, Braemar, Aberdeenshire. Carrigaloe, co. Cork; Lettermore, Con- 
nemara, co. Galway. 
61. L. exigua Nyl. Flora, 1873, p.197.—Thallus subeffuse, thin, 
unequal, subgranulate or scattered, whitish, pale-greyish or dark 
(K—, CaCl—); hypothallus indistinct. Apothecia small, plane or 
convex, crowded, black or blackish ; the thalline margin thin, often 
somewhat crenulate, whitish; hypothecium colourless; spores 
0,011-18 mm. long, 0,006-8 mm. thick.—Cromb. Grevillea, xviii. 
p. 46; Sm. Eng Fl. v. p. 187.—Rinodina ewigua Gray, Nat, Arr. 
i. p. 450; Mudd, Man. p. 143 pro parte. Lecanora sophodes var. 
exigua Cromb. Lich. Brit. p. 49; form ewigua Leight. Lich. Fl. 
p. 224, ed. 3, p. 214. Lichen ewiguus Ach. Prodr. (1798) p. 69; 
Eng. Bot. t. 1849. Lichen pericleus (non Ach.) Eng. Bot. t. 1850. 
Lecanora periclea Sm. Eng. Fl. v. p. 187; Tayl. in Mack. Fl. Hib. 
ii. p. 183. Rinodina periclea Gray, Nat. Arr. i. p. 449 pro parte. 
R. exigua 6. periclea Mudd, Man. p. 143.—Brit. Hxs.: Mudd, n. 
107; Larb. Lich. Hb. nos. 169, 261. 
Probably descends from ZL. sophodes, with which at times it seems sub- 
confluent, but differs in the colour of the more effuse thallus, and especi- 
ally in the smaller spores. It usually spreads extensively, but at times 
when associated with other crustaceous lichens it is much smaller, though 
scarcely limited by a distinct hypothallus. It is always well fertile. 
