LECANORA.] LECANO-LECJDKEI. 417 



and the character of the thalline margin of the apothecia. These in the 

 British specimens are somewhat large and at times scattered. 



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

 Distr. Only sparingly in the S W. Highlands and the Central Grampians, 

 Scotland. B. M. : Barcaldine, Argyleshire ; Craig Tulloch, Blair Athole, 

 Perthshire. 



95. L. intnmescens Koerb. Syst. Lich. Germ. (1855), p. 143. 

 Thallus determinate, thin, smooth, at length rimoso-areolate, whitish 

 (K + yellowish, CaCl ). Apothecia somewhat convex, moderate, 

 brown or carneous, at times slightly livid-pruinose : the thalline 

 margin thick, entire, inflexed or subci enate, snow-white ; paraphyses 

 crowded, thick, yellowish-brown towards the apices ; epithecium 

 granulose ; spores 0,012-16 mm. long, 0,006-8 mm. thick ; hymenial 

 gelatine bluish, then wine-reddish with iodine. Cromb. Grevillea, 

 xii. p. 601. L. subfusca forma intumescens Leight. Lich. Fl. p. 202, 

 ed. 3, p. 186. Parmelia intumescens llebent. Prodr. Fl. neom. 

 (1804) p. 301. Lichen pallidus Dicks. Crypt, fasc. ii. p. 12. Brit. 

 Exs. : Dicks. Hort. Sic. n. 23. 



Easily distinguished from the allied species by the colour of the thalline 

 margin of the apothecia, though in this respect it is subconfluent with 

 states of L. rugosa. From this, however, it differs in the thinner, smoother 

 thallus, the less crowded and more convex apothecia, the colour of the 

 paraphyses, and the thinner spores. The spermogones have the spermatia 

 (as in L. atryned) 0,020-30 mm. long. 



Hob. On smooth trunks and branches of trees in wooded maritime and 

 upland districts. Distr. Local in Great Britain; very rare in S.W. Ire- 

 land. B. M. : Shiere, Surrey ; New Forest, Hants ; Ullacombe, Bovey 

 Tracey, S. Devon ; Cirencester, Gloucestershire ; Rhiwgreidden, Merio- 

 nethshire. New Galloway, Kirkcudbrightshire ; Barcaldine, Argyle- 

 shire ; Fiularig, Killiu, and Craig Calliach, Perthshire ; Morrone, Braemar, 

 Aberdeenshire ; Loch Linnhe, Inverness-shire. Tervoe, co. Limerick. 



96. L. cMarotera Nyl. Flora, 1872, p. 550, nota 1. Thallus 

 determinate or subdeterminate, thickish, areolato-diffract, verru- 

 culoso-granulate, white (K + yellow, CaCl ). Apothecia large, 

 sessile, plane or somewhat convex, pale-testaceous, the thalline 

 margin thick, crenulate ; spores oblong or ellips.oideo-oblong, 0,009- 

 11 mm. long, 0,007-9 mm. thick ; paraphyses distinct, thick ; epi- 

 thecium not inspersed ; hymenial gelatine persistently deep bluish 

 with iodine. Leight. Lich. Fl. ed. 3, p. 182. 



Distinguished from subspecies L. chlarona by the thicker thallus, the 

 large, paler apothecia, the non-inspersed epithecium, and the reaction of 

 the hymenial gelatine. It has somewhat the aspect of states of Lecanora 

 pallescens, with which, however, it can scarcely be confounded. The 

 apothecia are either somewhat scattered or approximate and subconfluent, 

 occasionally slightly pruinose, with the thalline margin at length flexuose. 

 In the two British specimens seen the spermogones are only sparingly 

 present, with the spermatia rather longer than in subsp. L. chlarona. 



Hab. On the trunks of trees in upland districts. Distr. Only in the 



2E 



