lecidea] lecideace^ 65 



cave or at length plane, obtusely margined ; hypothecium thin, 

 blackish-brown ; paraphyses slender, discrete, dark-brown at 

 the apices ; spores ellipsoid or ellipsoid-oblong, large, 0,027-38 

 mm. long, 0,016-22 mm. thick ; hymenial gelatine bluish then 

 tawny-wine-red with iodine. — Carroll in Journ. Bot. v. p. 255 

 (1867); Cromb. Lich. Brit. p. 80; Leight. Lich. Fl. p. 296; 

 ed. 3, p. 305. L. scutulata Stirton in Grevillea iii. p. 34 (1874) ; 

 Cromb. in Grevillea iii. p. 143 (1875). 



Closely allied to the following species, from which it differs in the 

 more contiguous, at times subrugose thallus and in the more concave, 

 immersed apothecia. In the original specimen cephalodia are absent 

 as is usually the case in Britain. 



Hab. On schistose rocks in mountainous regions. — Distr. Only 

 sparingly in N. Wales and on the S. Grampians, Scotland. — B. M. 

 Cader Idris, Merioneth ; Snowdon, Carnarvon ; Craig Calliach, above 

 Loch-na-Gat, and near the summit of Ben Lawers, Perthshire. 



Form circumcissa Nyl. ex Cromb. in Journ. Bot. xx. p. 275 

 (1882). — Thallus pinkish- white ; apothecia somewhat small, im- 

 marginate, circumciss-lecanoroid ; otherwise as in the type. 



From the apothecia having apparently a thalline margin, this 

 might readily be taken for a Lecanora of the section of L. cinerea. 

 The cephalodia in the few specimens gathered are not unfrequent. 



Hah. On schistose rocks in mountainous regions. — Distr. Ex- 

 tremely local and scarce in N. Wales and on one of the S. Grampians, 

 Scotland. — B. M. Snowdon, Carnarvonshire; Craig Calliach, Perth- 

 shire. 



110. L. panseola Ach. in Vet. Ak. Handl. xxix. p. 267 (1808) 

 <fe Lich. Univ. p. 201. — Thallus determinate, areolate-granulose, 

 thinnish or somewhat thick, greyish-white, whitish or cream- 

 coloured, the areolae tumid, rimose-difFract, smooth (Ki -\- 

 yellowish, CaCl f -f reddish, K (CaCl) -|- deep red), cephalo- 

 diferous, the cephalodia tuberculate, reddish ; hypothallus dark- 

 brown. Apothecia small or moderate, appressed or immersed, 

 at first concave, then plane, at length convex, black or brownish- 

 black, pruinose or denudate, the margin thickish at length 

 excluded ; paraphyses slender, brown or dark-brown at the 

 apices ; hypothecium thick, blackish ; spores ellipsoid or ovoid, 

 0,017-27 mm. long, 0,008-12 thick, often with a halo and then 

 0,027-30 mm. long, 0,018-20 mm. thick; hymenial gelatine 

 deep-blue with iodine. — Carroll in Journ. Bot. v. p. 255 (1867) ; 

 Leight. in Ann. Mag. Nat. Hist. ser. 4, iv. p. 199 (1869) ; Cromb. 

 Lich. Brit. p. 80 ; Leight. Lich. Fl. p. 280 ; ed. 3, p. 284. L. 

 cechumena Tayl. in Mackay Fl. Hib. ii. p. 117 (1836) (non Ach.). 

 Lichen athrocarpus Sm. Engl. Bot. t. 1829 (1808) (non Ach.). 

 Aspicilia athrocarpa Mudd Man. p. 16 (1861). 



Exsicc. Leight. n. 384 ; Larb. Lich. Hb. n. 142. 



This and the preceding are well characterized by the thallus being 

 variegated by more or less frequent cephalodia intermixed with the 

 areolae. The thallus varies in thickness, being at times very thin and 

 II. F 



