rRCEOLARlA.] LECASO-LECIDEEI. 517 



H(tb. Oil rocks and wall,, very rarely on old wood, from maritime to 

 subalpine districts. — Dislr. (teneral aud cuuiTuoa in Great Britain ; ap- 

 parently rare in the Channel Islands and in Ireland, thouj^h ])lentiful 

 where it occurs. — B. M. : Island of Guernsey. Livermere, SuH'ulk ; 

 Walthanistow, Essex ; Kew Gardens, Surrey ; Barton Mills, Sussex ; 

 near Shankliu, Isle of AVif,'^ht ; Lustleigh, S. Devon ; near Padstow, 

 Cornwall; Bathanipton Downs, Somerset; Ampthill, Bedfordshire; 

 Gojmagog Hill and Chevely Park, Cambridgeshire ; near Buxton, Derby- 

 shire ; Bardun Hill, Leicestershire; Cader Idris and Barmouth, Merio- 

 nethshire; Island of Anglesea ; Oswestry, Gruishill, near Shrewsbury, 

 and High Rock, Bridgenorth, Shropshire ; Lounsdale, Cleveland, York- 

 shire ; Teesd.ile, Durham ; Stavelev, "Westmoreland ; Chester*,- North- 

 umberland ; Alston, Cumberland. Xew Galloway, Kirkcudbri^-htshire ; 

 King's Park aud Craig Lockhart, Edinburgh ; West Water, Fifeshire ; 

 Appin, Argyleshire ; Den of Mains, Forfarshire : Ben Vrackie and near 

 Dunkeld, Perthshire ; Morrone, Braem tr, Aberdeenshire ; near Fort 

 WiUiam, luverness-shire. IvilcuU}-, co. Cork; Loughcooter, co. Galway. 



Form pluinbea Ach. Meth. (1503) p. 147. — Thallus grepsh- 

 leadeu-coloured. Apotkecia usually small and naked ; otherwise as 

 iu the type. 



Characterized chiefly by the darker thallus, which is probably owing 

 to the nature of the substratum. 



Hab. On calcareous and cretaceous soil in maritime and upland 

 .«>ituations. — Distr. Apparentlv local and scarce in S. and Central Eng- 

 land aud the S.W. Highlands of Scotland.— B. M. : Near Hoathly, 

 Sussex ; Buxton, Derbysliire. Island of Lismore, Argyleshire. 



Subsp. TJ. bryophila Xyl. ex Xorrl. Medd. Siillsk. pro F. et Fl. 

 Feuu. i. (1S76) p. '21 . — Thallus thinner, smoother, or less rugose, 

 greyish-u bite or whitish, otten obsolete or scarcely visible. Apo- 

 thecia smaller, the thalline margin subevanesceut ; otherwise as in 

 the type. — Cromb. Grevillea, xix. p. 60.- — U. scruposa var. hri^o- 

 phila Mudd, Man. p. IGo ; Cromb. Lich. Brit. p. 50 ; forma, Leight. 

 Lich. Fl. p. 235, ed. 3, p. 24t). Lichen bnfophilus Ehrh. Exs. 

 (17S5) n. 236.— Brit. Exs. : Leight. nos. 359, 360 : Larb. Lich. Hb. 

 nos. 63, 221. 



A good subspecies distinguished by the characters given. The thallus, 

 Avhich is usually somewhat effuse, is at times somewhat dealbate and 

 subpulverulent, when it is var. 3- dealbata Ach. Lich. Univ. p. •"341. It 

 often grows upon the folioles and the podetia of forms of Cladonia 

 pyxidata either as a pai-asite or with scanty traces of a proper thaUus, 

 aud it is then Lecanora scruposa ,S. parasitica Somm. Suppl. Fl. Lap. 

 p. 100 pro parte, form ecrmtacea Nyl. Cromb. Grevillea, xix. p. 60. This 

 condition, however, is scarcely entitled to rank even as a form. 



Hab. Overspreading mosses and on Cladonia pj/ridafa in maritime 

 and upland tracts. — Listr. Xot uncommon in Great Britain and Ireland ; 



rare in the Channel Islands. B. M. : Quenvais, Island of Jei-sey. 



Thetford Warren, Norfolk ; Eppiuir Forest, Essex : near Torquay and 

 on Lustleigh CTeeve, S. Devon : St. Minver ai.d Penzance, Cornwall ; 

 Pembury Park, Cirencester, Gloucesrershire ; Matlock, Derbyshire ; 

 Dolgelly and Barmouth, Merioneth ; High Rook, Bridgenorth, Shrop- 

 shire ; Lanbraugh, Cleveland, Yorkshire : Eglestone. Dmliam. Island 

 of Lismore and Appin, Aj-gyleshire ; Glen Lochay, Killin, Ben Lawers, 



