LECANOKA.] LECAtfO-LECIDEEI. 485 



188. L. rhagadiza Nyl. Flora, 1881, p. 178. Thallus conti- 

 nuous, unequal, variously rhagadiosely fissured, dark-olive-greyish 

 (K(CaCl) ). Apothecia small, innate, concave or plane, reddish- 

 flesh-coloured ; paraphyses slender ; spores oblongo-bacillar, about 

 0,0035 mm. long, about 0,0010 mm. thick; hymenial gelatine 

 tawny-wine-coloured with iodine. Cromb. Grevillea, x. p. 23. 



A peculiar plant, as observed by Ny lander /. c., near L. rufescens, but 

 differs in the characters given of the thallus and apothecia. In the single 

 specimen gathered the thallus is well fertile. 



Hob. On moist sandstone rocks in a maritime locality, Distr. Ex- 

 tremely local and scarce in N.W. England (Barrowmouth, Whitehaven, 

 Cumberland). 



189. L. admissa Nyl. Flora, 1867, p. 370, et 1872, p. 364. 

 Thallus indeterminate, adnate, anguloso-areolate, brownish- or dark- 

 red, the areolae plane, contiguous, opaque, blackish beneath 

 (K(CaCl) ). Apothecia minute, impressed, somewhat angular, 

 subconcolorous, the thalline margin obtuse or little distinct ; para- 

 physes moderate, jointed ; spores oblong, 0,004-5 mm. long, 0,0010- 

 15 mm. thick ; hymenial gelatine bluish, then tawny wiue-coloured 

 with iodine.- Cromb. Grevillea, xix. p. 58. L. discreta Leight. 

 Lich. Fl. ed. 3, p. 171 pro parte. 



A good species well separated from L. rufescens, to which it is allied, 

 by the characters of the thallus and the fructification. The apothecia 

 are rarely solitary, but usually several slightly impressed in each areola. 

 In the Scottish locality the thallus was widely expanded, and, along with 

 the normal apothecia, bearing in the centre a 'few others, large, superficial 

 and deeply fissured at the margins. 



Hob. On exposed schistose rocks in suhalpine and alpine situations. 

 Distr. Extremely local and rare in N. Wales and on one of the S. Gram- 

 pians, Scotland. B. M. : Y Fegle fawr, near Barmouth, Merionethshire. 

 Summit of Ban Lawers, Perthshire. 



190. L. discreta Nyl. Flora, 1872, p. 364. Thallus verrucoso- 

 areolate, dark- or badious-brown, the areolae turgid, discrete, subru- 

 gulose (K , CaCl ). Apothecia minute, impressed in the areolae, 

 at times slightly convex in the centre, concolorous, the thalline 

 margin obtuse ; spores oblong, 0,003-4 mm. long, 0,001 mm. thick ; 

 paraphyses slender; hymenial gelatine wine-red with iodine. Cromb. 

 Grevillea, xix. p. 58 ; Leight. Lich. Fl. ed. 3, p. 171 pro parte. 

 Parmelia squamulosa y. discreta Ach. Meth. Suppl. (1803) p. 41. 

 Lecanora admissa (non Nyl.) Cromb. Lich. Brit. p. 57 ; Leight. Lich. 

 Fl. p. 185. 



Characterized by the normally turgid and discrete thalline areolae ; 

 though occasionally in the British specimens they are here and there 

 more depressed and subcontiguous, rarely several confluent. The apo- 

 thecia are usually solitary, but sometimes several in each areola. 



Hab. On rocks in subalpine tracts. Distr. Local and scarce in N. 

 England and on the N. Grampians, Scotland. B. M. : Teesdale, Durham. 

 Summit of the Khoil, near Ballater, Aberdeenshire. 



