472 LICHENACEI. [LECANORA. 
only in a young state are more or less lecanorine. In the two British 
specimens, the thallus is subolivaceous with the areole somewhat 
gibbous at the circumference, They are well fertile, but the spermogones 
are very rarely present. 
Hab. On a mica-schist boulder in a mid-alpine situation. —Distr. 
Extremely local and rare on one of the S. Grampians, Scotland.—B. M.: 
Loch-na-Gat, Ben Lawers, Perthshire. 
Subsp. 2. L. subdepressa Nyl. Flora, 1873, p. 69.—Thallus 
subdeterminate, thickish, rimoso-areolate, greyish or dark-grey ; 
hypothallus indistinct. Apothecia small or submoderate, concave 
or somewhat plane, black; the thalline margin depressed, at length 
excluded; spores variable in size, from 0,018-24 to 0,027-32 mm, 
long, 0,011-15 mm. thick.—Cromb. Grevillea, xix. p. 57; Journ. 
Bot. 1885, p. 195 (ut sp. propr.).—Urceolaria rufescens Tayl..in 
Mack. Fl. Hib. ii. p. 132 pro parte. 
Subsimilar to the preceding subspecies, but differs at once in the 
longer spores and the more distinctly lecanorine apothecia. Nylander 
says (Lich. Fret. Behr. p. 30) that the thallus in specimens from 
Behring’s Straits is subradiate at the circumference, which is not the 
case in ours. The apothecia are either somewhat scattered or at times 
several and small in each areola, The spermogones have the spermatia 
0,009-15 mm, long, scarcely 0,0001 mm. thick. 
Hab. On schistose rocks in mountainous regions.—Distr. Local but 
pepe where it occurs, in Great Britain and Ireland.—B. M.: Cader 
dris and Camlan Valley, near Dolgelly, Merionethshire; Snowdon, 
Carnarvonshire ; Windermere, Westmoreland. Barcaldine, Argyleshire ; 
Craig Calliach and Ben Lawers, Perthshire; Morrone, Braemar, Aber- 
deenshire. Cappamore, near Dunkerron, co, Kerry; Maam Turk mt., 
Connemara, co. Balway. 
170. L. cesiocinerea Nyl. Flora, 1872, p. 364.—Thallus deter- 
minate, thickish, areolato-verrucoso-diffract, csesio-greyish, greyish- 
white or sordid- greyish (K—, CaCl—); hypothallus black, 
usually limiting the thallus. Apothecia submoderate, at first 
immersed and concave, at length somewhat prominent and plane, 
black or dark-olive; the thalline margin thickish, entire, or sub- 
entire; spores 8na, ellipsoid, 0,018-25 mm. long, 0,010-14 mm. 
thick; hymenial gelatine tawny wine-red with iodine.—Leight. 
Lich. Flora, ed. 3, p. 184; Cromb. Grevillea, xix. p. 57.—Brit. 
Eas.: Leight. n. 204; Larb. Lich. Hb. n. 60. 
_ Usually confounded with L. gibbosa, but now definitely separated by 
differences in the thallus and fructification. At times it is widely 
expanded with the hypothallus little visible. In shady habitats the 
thallus is more ceesious and but sparingly fertile. The spermogones (fide 
Nyl.) have the spermatia 0,007-11 mm. long, 0,0005-7 mm. thick. 
Hab. On rocks in maritime and mountainous districts —Déstr. Only 
here and there throughout Great Britain and Ireland.—B. M. : Roughton 
and near Penzance, Cornwall; Liandyssil, Cardiganshire; Malvern 
Hills, Worcestershire ; Longmynd, Shropshire; Lamplugh, Cumberland. 
Barcaldine, Argyleshire ; King’s Park, Stirling; Glen Lyon and Ben 
