478 LicnEXACEi. [lec.vnora. 



Barmouth, ^leriouetlisliire ; Trefriw Falls, Carnarvonshire ; Teesdale, 

 Durham. Appin and Glencoe, Argyleshire ; Glen Falloch and Ben Lawers, 

 Perthshire ; Glen Callater, Braemar, Aberdeenshire. Ballaghbeama Gap 

 and Dunkerron, co. Kerry ; Connor Clitfs, Diugle, co. Kerry ; Ballynakill 

 and Lough Inagh, Connemara, co. Galway. 



177. L. flavida Hepp, Exs. (1860) ii. G30 ; Fr. fil. Vet. Ak. 

 Handl. vii. (1S(J7) p. 21. — Thallus effuse, very thin, rimoso-areolate, 

 subleprose, pale ochraceous or glaucous-grey (K — , CuCl— ). Apo- 

 thecia very minute, innate, at first concave, then plane, black ; the 

 thalline margin thin, entire; spores Stub, ellipsoid, 0,012-18 mm. 

 long, 0,007-11 mm. thick ; paraphyses not discrete, bluish towards 

 the apices ; hymenial gelatine deep blue with iodine. — Leight. Lich. 

 Fl. ed. 3, p. 105. — AspiciUa ochrncea (non Schaer.) Mudd, Man, 

 p. 163. Lecanora gihbosa forma lacustris Leight. Lich. Fl. ed. 1, 

 p. 210 pro parte. — Brit. Exs. : Leight. n. 292 ; Mudd, n. 136. 



A rather inconspicuous plant which, in dry weather, might readily be 

 overlooked, but is well characterized by the characters given. Wlien sub- 

 ochraceous, the black apothecia and the more leprose thallus at once 

 distinguish it from the preceding species ; while the minute fruit, apart 

 from anatomical diti'erences, definitely separates it from the ochraceous 

 state of L. calcarea. The apothecia are usually very numerous. 



Hub. On moist rocks and stones in hilly districts. — Distr. Found only 

 in N. England. — B. M. : Cockshaw Bank, Cleveland, Yorkshire. 



178. L. Prevostii Fr. fil. Lich. Scand. (1871) p. 288.— Thallus 

 effuse, very thin, continuous, whitish, grej-ish- or flesh}-- white, often 

 obsolete (K — , CaCl — ). Apothecia minute, deeply immersed, sub- 

 rotundate or variously difform, concave, carneous or pale-carneous, 

 the proper margin connivent, discrete from the thalline margin ; 

 spores ellipsoid, 0,014-22 mm. long, 0,009-11 mm. thick ; para- 

 physes uot discrete ; epithecium colourless ; hymenial gelatine 

 bluish, then sordidly -wine-coloured with iodine. — Leight. Lich. Fl. 

 ed. 3, p. 198 ; Cromb. Grevillea, six. p. 58. — Lecanora epulotica\sx. 

 Prevostii Cromb. Lich. Brit. p. 55 ; Leight. Lich. Fl. ed. 1, p. 212. 

 Gyalecta (j'oica A.(ih..'i'Lc\^\i.t. Angio. Lich. t. 15. fig. 1, G)/alecfa 

 Prevostii Fr. Lich. Eur. (Ib31) p. 197. 



At one time regarded by Nylander as a vaiiety of the following species, 

 differing chiefly in the irregular foveolate apothecia. It belongs, how- 

 ever, to this subsection, from the character of the gonidia, which^V7<^ Tli, 

 M. Fries (Lich. Scand. p. 289) are 0,009-16 mm. in diameter. In 

 the British specimens the thallus is usualh^ confused with the substratum, 

 ■whence forma j^i'oletaria Fr. fil. I. c. It is then, from the colour of the 

 very small, though numerous, apothecia, a rather inconspicuous plant. 



Hub. On calcareous rocks in upland tracts of hilly and mountainous 

 districts. — Distr. Seen from only a few localities in \\\ and N. Eugland, 

 as also from the Grampians, .Scotland. — B. M. : Bathampton Downs, 

 Somerset ; Teesdale, Durham ; Levens, AVestmoreland. Craig Tulloch, 

 Blair Athole, Perthshire ; Craig Guie, Braemar, Aberdeenshire. 



