LECANORA.] LECAXO-L>yiDKKr. 415 



Var. /?. cenisia Xyl. e.c Laiuy, Bull. Soc. But. Fr. t. xxv. (1878) 

 p. 4i>'J. — Thalliis more or less verruoose. Apothecia usually some- 

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

 greyish-pruinose, — Cromb. Grevillea, xviii. p. (!S. — Lecanora cenisia 

 Ach. Lich. L'niv. (1810) p. 301. 



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

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

 In the single ]3ritish specimen, which is well fertile, these are but small, 

 not large as they are described by Acharius. 



Hab. On schistose rocks in a maritime district. — Diatr. Only very 

 sparingly in X.E. Scotlanl. — B. .M. : Xear Portlethen, Kincardineshire. 



Var. y. melacarpa Xyl. e.v Cromb. Grevillea, i. (1873) p. 171. — 

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

 spersed ; spores U,Ul3-l(j mm. long, 0,007-9 mm. thick. — L. suh- 

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



A well-marked variety characterized by the colour of the apothecia? 

 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 TuUoch. Blair Athole, Perthshire. 



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

 i. (1876) p. 23. — Thalliis determinate or subdeterminate, 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 thaliine margin entire 

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

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

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

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

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

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

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



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

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

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

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

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

 thicker and verrucoso-diffract. The apothecia in these are numeroas 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 iu S. Ireland. — B. M. : Boulay Bay, Island of Jersey ; Chateau 

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

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

 Merionethshire ; Cwm Ffynnon Llugy and X'aut Francon, Carnarvon- 

 shire ; Haughmoud Hill, Shropshire ; Ayton, Cleveland, Yorkshire • 



