472 LICHENACEI. [LECANOEA. 



only in a young state are more or less lecanorine. In the two British 

 specimens, the thallus is subolivaceous with the areote 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. suMepressa 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. PI. 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. Ny lander 

 says (Lich. Fret. Behr. p. 30) that the thallus in specimens from 

 Bearing'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 

 plentiful where it occurs, in Great Britain and Ireland. B. M. : Cader 

 Idris 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. Gal way. 



170. L. caesiocinerea Nyl. Flora, 1872, p. 364. Thallus deter- 

 minate, thickish, arcolato-verrucoso-diffract, caesio-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 8nae, 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, six. p. 57. Brit. 

 Exs. : 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 sperm ogones(/de 

 Nyl.) have the spermatia 0,007-11 mm. long, 0,0005-7 mm. thick. 



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

 here and there throughout Great Britain and Ireland. B. M. : Roughton 

 and near Penzance, Cornwall; Llandyssil, Cardiganshire; Mah 

 Hills, Worcestershire ; 

 Barcaldine, Argyleshire ; 



