URCEOLARIA. | LECANO-LECIDEEI. 517 
Hab. On yocks and walls, very rarely on old wood, from maritime to 
subalpine districts.—Distr. General and common in Great Britain; ap- 
parently rare in the Channel Islands and in Ireland, though plentiful 
where it occurs—B. M.: Island of Guernsey. Livermere, Suffolk ; 
Walthamstow, Essex; Kew Gardens, Surrey; Barton Mills, Sussex ; 
near Shanklin, Isle of Wight; Lustleigh,»S. Devon; near Padstow, 
Cornwall; Bathampton Downs, Somerset; Ampthill, Bedfordshire ; 
Gogmagoy Hill and Chevely Park, Cambridgeshire; near Buxton, Derby- 
shire; Bardon Hill, Leicestershire; Cader Idris and Barmouth, Merio- 
nethshire; Island of Anglesea; Oswestry, Gruishill, near Shrewsbury, 
and High Rock, Bridgenorth, Shropshire; Lounsdale, Cleveland, York- 
shire; Teesdale, Durham; Staveley, Westmoreland; Chesters, North- 
umberland ; Alston, Cumberland. New Galloway, Kirkcudbrightshire ; 
King’s Park and Craig Lockhart, Edinburgh; West Water, Fifeshire ; 
Appin, Argyleshire; Den of Mains, Forfarshire; Ben Vrackie and near 
Dunkeld, Perthshire; Morrone, Braemar, Aberdeenshire; near Fort 
William, Inverness-shire. Kilcully, co. Cork; Loughcooter, co. Galway. 
Form plumbea Ach. Meth. (1803) p. 147.—Thallus greyish- 
leaden-coloured. Apothecia usually small and naked; otherwise as 
in the type. 
Characterized chiefly by the darker thallus, which is probably owing 
to the nature of the substratum. 
Hab. On calcareous and cretaceous svil in maritime and upland 
situations.—Distr, Apparently local and scarce in S. and Central Eng- 
land and the 8.W. Highlands of Scotland.—B. M.: Near Hoathly, 
Sussex ; Buxton, Derbyshire. Island of Lismore, Argyleshire. 
Subsp. U. bryophila Nyl. ex Norrl. Medd. Sallsk. pro F. et FI. 
Fenn. i. (1876) p. 27.—Thallus thinner, smoother, or less rugose, 
greyish-white or whitish, often obsolete or scarcely visible. Apo- 
thecia smaller, the thalline margin subevanescent; otherwise as in 
the type.—Cromb. Grevillea, xix. p. 60.—U. scruposa var. bryo- 
phila Mudd, Man. p. 165; Cromb. Lich. Brit. p.50 ; forma, Leight. 
Lich. Fl. p. 235, ed. 3, p. 240. Lichen bryophilus Ebrh. Exs. 
(1785) n. 236.—Brit. Hws.: Leight. nos. 359, 360; Larb. Lich. Hb. 
nos. 63, 221. 
A good subspecies distinguished by the characters given. The thallus, 
which is usually somewhat effuse, is at times somewhat dealbate and 
subpulverulent, when it is var. 8. dealbata Ach. Lich. Univ. p. 341. It 
often grows upon the folioles and the podetia of forms of Cladonia 
pyxidata either as a parasite or with scanty traces of a proper thallus, 
and it is then Lecanora scruposa 8. parasitica Somm. Suppl. Fl. Lap. 
p. 100 pro parte, form ecrustacea Nyl. Cromb. Grevillea, xix. p.60. This 
condition, however, is scarcely entitled to rank even as a form. 
Hab. Overspreading mosses ‘and on Cladonia pyridata in maritime 
and upland tracts.— Distr. Not uncommon in Great Britain and Ireland ; 
yare in the Channel Islands.—--B. M.: Quenvais, Island of Jersey, 
Thetford Warren, Norfolk; Epping Forest, Essex; near Torquay and 
on Lustleigh Cleeve, S. Devon; St. Minver and Penzance, Cornwall; 
Pembury Park, Cirencester, Gloucestershire; Matlock, Derbyshire ; 
Dolgelly and Barmouth, Merioneth; High Rock, Bridgenorth, Shrop- 
shire; Lanbraugh, Cleveland, Yorkshire; Eglestone, Durham. Island 
of Lismore and Appin, Argyleshire; Glen Lochay, Killin, Ben Lawers, 
