472 LICHENACEI. [lECANOEA. 



ouly in a voung state are more or less lecanoriue. In the two British 

 .specimens, the thalhis is subolivaceoiis Avith the areola) 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-ua-Gat, Ben Lawers. Perthshire. 



Subsp. 2. L. siibdepressa Xyl. Flora, 1873, p. 69.— Thallus 

 subdeteriniuate, thickish, riraoso-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 0,0ib-24 to 0,027-32 mm. 

 long, 0,011-15 mm. thick. — Cromb. Grevillea, xix. p. 57; Journ. 

 liot. 18S5, p. 195 (ut sp. propr.). — Urceolaria rufescens Tayl. in 

 Mack. Fl. Plib. 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 eitlier somewhat scattered or at times 

 several and small in each areola. The spermogones have the spermatia 

 0,009-lo mm. long, scarcely 0,0U01 mm. thick. 



H(tb. On schistose rocks in mountainous regions. — Distr. Local but 

 plentiful where it occurs, in Great Britain and L-eland. — B. M. : Cader 

 Idris and Camlan Valley, near Bolgelly, Merionethshire ; Snowdon, 

 Carnarvonshire ; Windermere, "Westmoreland. Barcaldine, Argyleshire ; 

 Craig CaUiach and Ben Lawers, Pertlishire ; Morroue, Braemar, Aber- 

 deenshire. Cajipamore, near Duukerron, co. Kerry; Maam Tm-k mt., 

 Connemai'a, co. Galway. 



170. L. caesiocinerea Jfyl. 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 buse, ellipsoid, 0,018-25 mm. long, 0,010-14 mm. 

 thick ; hymenial gelatine tawny wine-red with iodine. — Leight. 

 Lich, Flora, ed. 3, p. 134 ; Cromb. Grevillea, xix. p. 57. — Brit. 

 Exs. : Leight. n. 204 ; Larb. Lich. Hb. n. 60. 



L^sually confounded with L. f/ibbosa, 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 cfesious and but sparingly fertile. The spermogones (/?rfe 

 Nj-l.) have the spermatia 0,007-11 mm. lung, 0,000.5-7 mm. thick. 



Hab. On rocks in maritime and mountainous districts. — Distr. Only 

 here and there thronghout Great Britain and Irehmd. — B. ]\J. : Houghton 

 and near Penzance, Cornwall ; Llandyssil, Cardiganshire ; Malvern 

 Hills, Worcestershire ; Lougmynd, Shropshire ; Lamplugh, Cumberland. 

 Barcaldine, Argyleshire ; King's Park, Stirhng ; Glen Lyon and Ben 



