LECANORA. | LECANO-LECIDEEI. 477 
8.W. Ireland.—B. M.: Fingle Bridge, near Chagford, 8. Devon; Dol- 
gelly and Rhiwgreidden, Merionethshire; Bettwys-y-coed, Denbighshire ; 
Island of Anglesea; Wrekin Hill, Shropshire; LEglestone, Durham; 
Staveley, Kendal, Westmoreland ; Lamplugh, Cumberland. King’s Park, 
Edinburgh; Ben Lawers and Craig Tulloch, Perthshire; Glen Callater 
aud Morrone, Braemar, Aberdeenshire. Crogham and Mangerton, co. 
Kerry. 
Form atrata Cromb. Grevillea, xix. (1891) p. 58.—Thallus only 
here and there sparingly visible upon the predominating hypothallus. 
Apothecia scattered, minute.—Gyalecta atrata Ach. Vet. Ak. Handl. 
1808, p. 229. 
A rudimentary, though apparently permanent condition in which 
scanty traces of a ferruginous thallus are seen only around the apothecia, 
which in the British specimens are numerous, 
Hab. On quartzose rocks in an alpine locality—Distr. Only very 
sparingly. on one of the N. Grampians, Scotland——B. M.: Morrone, 
Braemar, Aberdeenshire. 
176. L. lacustris Fr. fil. Vet. Akad. Hand]. vii. (1867) p. 24.— 
Thallus determinate or subeffuse, thin, smooth, rimuloso-diffract, 
pale testaceous or ochraceous (K—, CaCl—). Apothecia minute, 
urceolato-innate, reddish testaceous or brownish; the thalline 
margin tumid or usually little distinct; spores 8ne, ellipsoid, 0,013- 
18 mm. long, 0,006-9 mm. thick ; paraphyses not discrete, slightly 
brownish or yellowish at the apices; hypothecium colourless ; 
hymenial gelatine bluish, then sordid-wine-red or tawny with 
iodine.—Cromb. Grevillea, i. p. 172; Leight. Lich. Fl. ed. 3, p. 195 
(excl. forma punctata).—Lecanora gibbosa forma lacustris Leight. 
Lich. Fl. ed. i. p. 210; subsp. lacustris Cromb. Lich. Brit. p. 55. 
Lichen lacustris With. Arr. ed. 3 (1796) iv. p. 21, t. 31. fig. 4. 
Urceolaria Acharit Gray, Nat. Arr. i. p. 457; Hook. Fl. Scot. ii. 
p- 47; Sm. Eng. Fl. v. p. 172; Tayl. in Mack. Fl. Hib. ii. p, 132 
(incl. var. 6). Lichen Acharti Westr. Eng. Bot. t. 1087. Aspicilia 
epulotica Mudd, Man. p. 161 pro maxima parte.—Brit. Ewvs.: Cromb., 
n. 71. 
The thallus is normally pale, almost white, but is usually more or less 
ochraceous from being tinged with peroxide of iron. It often spreads 
extensively over the substratum and is at times semi-aquatic. The 
apothecia, which are numerous and often crowded, are at first minute, 
immersed, rarely at length prominent, occasionally in age becoming sub- 
moderate, plane, and distinctly margined by the thallus. Occasionally 
the spores are rather thicker, 0,012 mm., when it is Lecidea subepulotica 
Nyl. Mém. Soc. Cherb. t. v. p. 337, a state which occurs also in Great 
Britain and Ireland.—Var. 8. cyrtaspis (Ach.) Cromb. Grevillea, xix. 
p. 58, does not belong to this species (¢/r. Fr. fil. Lich, Scand, p. 288), 
Hab. On rocks (often inundated) in streams in upland and subaipine 
districts.—Distr. Only here and there, though plentiful where it occurs, in 
Great Britain and Ireland.—B. M.: Lyndhurst Moor, New Forest, Hants ; 
Dartmoor, Devonshire; Withiel, Cornwall; Nannau, Dolgelly, and near 
