LECANOKA.] LKCANO-LECIDEEI. 361 



Island of Jersey. Near Glynde, Sussex; Kemble, Gloucestershire; 

 Weston, Oxfordshire ; Llanym'ynech Hill, Shropshire ; Ayton, Cleveland, 

 Yorkshire; Brotlghton Castle, Westmoreland. The Trossachs, Perth- 

 shire ; Cove, Kincardineshire ; near Aberdeen. 



Form Arnold! Nyl. Flora, 1883, p. 106. Thallus very small, 

 epruinose, cinnabarine, shortly and narrowly radiose, diffracto- 

 areolate in the centre. Apothecia minute, concolorous with the 

 thallus. Crornb. Grevillea, xviii. p. 44. Li-canora Arnoldi Wedd. 

 Bull. Soc. Bot. xxiii. (1876) p. 96. L. minlata Tayl. in Mack. Fl. 

 Hib. ii. p. 140. 



Only a minute condition of the type with naked miniate thallus and 

 apothecia. The three British specimens seen are well fertile. 



Ilab. On dry calcareous rocks in maritime and mountainous districts. 

 Distr. Only in N.E. England, the N. Grampians, Scotland, and S.W. 

 Ireland. B. M. : Ilartlepool, Durham. Morrone, Aberdeeushire. Dun- 

 kerron, co. KeiTy. 



Yar. /3. obliterascens Nyl. Flora, 1883, p. 99. Thallus small, 

 slightly and narrowly radiate at the circumference, vitelline. Apo- 

 thecia small, plane or convex, the thalline margin at length often 

 obliterated ; spores 0,008-0,011 mm. long, 0,004-5 mm. thick. 

 Cromb. Journ. Bot. 1885, p. 195. 



According to Nylander /. c., apparently only a variety of this sub- 

 species. In our British specimens, it occurs on the substratum in small 

 scattered patches, which occasionally have a tendency to become con- 

 fluent. The apothecia are numerous and crowded, almost obliterating 

 the thallus. 



Hob. On schistose rocks and walls in maritime and upland districts. 

 Distr. Found only in N. England, the Central Grampians, and N.E. 

 Scotland. B. M. : Near Ayton, Cleveland, Yorkshire ; Bassenthwaite, 

 Cumberland. Craig Tulloch, Blair Athole, Perthshire; Cove, Kin- 

 cardineshire. 



12. L. dissidens Nyl. Flora, 1875, p. 298. Thallus orbicular, 

 appressed, somewhat small, stellato-radiate, vitelline ; lacini 

 narrow, plane or somewhat convex, discrete, subfree at the circum- 

 ference (K-f purplish). Apothecia small, plane, concolorous (K -f- 

 purplish), the thalline margin subentire or crenulate ; spores 

 0,009-0,016 mm. long, 0,005-7 mm. thick. Cromb. Grevillea, iv. 

 p. 180. Phicodium murorvm form dissidens Leight. Lich. Fl. ed. 3, 

 p. 161. Lichen flavicans With. Arr. ed. 3, iv. p. 25 pro parte. 

 Lichen, eleyans Eng. Bot. t. 2181 (right-hand fig.). 



Looks like a variety of L. elegans, but is distinguished by the colour 

 (rarely subminiate) of the planer lacinia?. It approaches states of 

 subsp. L. tegular is, but the lacinise are more discrete, and the thalline 

 margin of the apothecia usually more or less crenate. The British 

 specimens are well fertile. 



Hab. On slate roofs of outhouses and on brick walls in lowland and up- 

 land tracts Distr. Found only here and there in England, but probably 



