LECAXORA.] LECANO-LECIDEEI. 415 



Var. ft. cenisia Xyl. ex Lamy, Bull. Soc. Bofc. Fr. t. xxv. (1878) 

 p. 409. Thallus more or less verrucose. Apothecia usually some- 

 what large and more convex, livid or yellowish-brown, slightly 

 greyish-pruinose, Cromb. Grevillea, xviii. p. 68. Lecanora cenisia 

 Ach. Lich. Univ. (1810) p. 361. 



Regarded by some authors as tho type of the species, from which it 

 differs, though probably only as a form, in the character of the apothecia. 

 In the single British specimen, which is well fertile, these are but small, 

 not large as they are described by Acharius. 



Hob. On schistose rocks in a maritime district. Distr. Only very 

 sparingly in N.E. Scotlanl. B. M. : Near Portlethen, Kincardineshire. 



Var. y. melacarpa Xyl. ex Cromb. Grevillea, i. (1873) p. 171. 

 Apothecia somewhat small, black; epithecium more or less in- 

 spersed ; spores 0,013-16 mm. long, 0,007-9 mm. thick. L. sub- 

 fusca forma melacarpa Leight. Lich. Fl. ed. 3, p. 187. 



A well-marked variety characterized by the colour of the apotheeia> 

 which gives it much the aspect of the following species. 



Hab. On mica-schist stones of a wall in an upland situation. Distr. 

 Only very sparingly on one of the Central Grampians, Scotland. B. M. : 

 Craig Tulloch, Blair Athole, Perthshire. 



93. L. coilocarpa Xyl. e.v Xorrl. Medd. Siillsk. pro F. et Fl. Fenn. 

 i. (1876) p. 23. Thallus determinate or subdetermiuate, thin, un- 

 equal or grauulato-rugose, whitish or greyish-white (K+ yellowish, 

 CaCl ). Apothecia small or submoderate, concave or at length 

 somewhat plane, brownish-black or blackish, the thalline margin entire 

 or subentire; paraphyses slender, discrete, dark-brown at the apices; 

 sporesO,012-18 mm. long, 0,006-9 mm. thick; hymenial gelatine bluish, 

 then violet-coloured with iodine. Cromb. Grevillea, xviii. p. 68. 

 L. siibfusca form coilocarpa Cromb. Lich. Brit. p. 51 ; Leight. Lich. 

 Fl. p. 202, ed. 3, p. 186 (excl. pinastri Schser.). L. subfusca ft. coilo- 

 carpa Ach. Lich. Univ. (1810) p. 393. Brit. Exs. : Leight, n. 52 ; 

 Hudd, n. Ill ; Larb. Caesar, n. 77. 



Often confounded with L. atra, but closely allied to subspecies 

 L. chlarona, from which it differs in the colour of the apothecia and the 

 characters of the thallus and paraphyses. In corticolous plants, of which 

 I have seen no British specimens, though these no doubt occur in the 

 Scottish Highlands, the thallus is thin, but in saxicolous ones much 

 thicker and verrucoso-diffract. The apotbecia in these are numerous and 

 at times crowded. 



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

 Not uncommon in the Channel Islands and Great Britain ; apparently 

 rare in S. Ireland. B. M. : Boulay Bay, Island of Jersey; Chateau 

 Point, Island of Sark. Kusthall Common, Kent; Helmenton, Corn- 

 wall ; Malvern, Worcestershire ; Trellick, Monmouthshire ; Barmouth, 

 Merionethshire ; Cwm Ffynnon Llugy and Naiit Francon, Carnarvon- 

 shire ; Haughmond Hill, Shropshire ; Ayton, Cleveland, Yorkshire ; 



