LECANORA | LECANORACEE 313 
almost entirely enclosed (f. porinoides Cromb. Monogr. i. p. 461 
(1894) ). A dense white pruina is generally present, but the rose- 
coloured disc is occasionally visible. 
Hab. On rocks, walls, and trunks of trees, rarely on palings, from 
maritime to mountainous regions.—Distr. General and common 
throughout the British Isles—B. M. Boulay Bay, Jersey; Chateau 
Point, Sark; Penzance and St. Issy, Cornwall; Ilfracombe and 
Torquay, Devon; Lyndhurst, New Forest, Hants; Ryde, I. of Wight ; 
Wolstonbury, Walmer, Ardingly Rocks, Peasemarsh and near Hastings, 
Sussex; Greenwich Park and near Tunbridge Wells, Kent; Chelmer, 
Ulting and Langford, Essex; near Tenby, Pembrokeshire ; Barmouth, 
Merioneth; Llandyssil, Cardiganshire; Nant Francon and Capel 
Curig, Carnarvonshire; near Shrewsbury, Shropshire; Hale’s End, 
Malvern, Worcestershire; Bardon Hill, Leicestershire; Silverdale, 
Lancashire; Ayton, Cleveland, Yorkshire; Egglestone, Durham; 
Wastdale and St. Bees, Cumberland; Chollerford and Waansbeck 
Valley, Northumberland; Arthur’s Seat, Edinburgh; West Water, 
Fife; Airds, Barcaldine, Lismore and Ballachulish, Argyll; Ben 
Lawers, Aberfeldy and Craig Tulloch, Blair Athole, Perthshire; Sidlaw 
Hills and Baldovan, Forfarshire; Portlethen and Cove, Kincardine- 
shire; Morrone, Glen Callater and Glen Dee, Braemar, Aberdeenshire ; 
Glen Nevis, Invernessshire; Applecross, Rossshire; Brandon Mt., 
Kerry; Clare Island and Achill, Mayo. 
Form nivea Cromb. Monogr. i. p. 462 (1894).—Thallus and 
thalline margin of the apothecia soft, snowy-white ; otherwise as 
in the species. 
A transition form evidently between the species and var. Turneri. 
It has only been collected once, but has probably been overlooked. 
Hab. On the trunk of an old tree in an upland situation.—B. M. 
Killaloe, Clare. 
Var. Turneri Nyl. in Mém. Soc. Sci. Nat. Cherb. v. p. 113 
(1857).—Thallus more or less leprose-powdery, whitish or greenish- 
white. Apothecia similar to the species but the thalline margin 
leprose.—Cromb. Lich. Brit. p. 54 & Monogr. i. p. 462 ; f. Turneri 
Leight. Lich. Fl. p. 190 (1871); ed. 3, p. 203. LZ. Turneri Ach. 
Syn. Lich. p. 70 (1814); Hook. in Sm. Engl. Flv. p.191. LZ. palles- 
cens var. Turneri Mudd Man. p. 155 (1861). Lichen Turneri Sm. 
Engl. Bot. t. 857 (1801). Rinodina Turneri 8. F. Gray Nat. Arr. 
i. p. 454 (1821). 
Ezsicc. Leight. n. 237 ; Mudd n. 127. 
A corticolous variety distinguished by the powdery sorediate surface 
of the thallus. The margins of the apothecia, usually entire, are 
occasionally furrowed, as also in the species (f. swherenata Cromb. in 
Grevillea xviii. p. 70 (1890) & Monogr. i. p. 462). 
Hab. On trunks of old trees in wooded regions.—Distr. Rather 
rare throughout the British Isles —B. M. Ugbrooke Park, Chudleigh, 
Devon; Carisbrook and Bembridge, I. of Wight; New Forest, Hants ; 
Hurstpierpoint, Chichester and Baleombe, Sussex; Holmwood, Surrey ; 
Epping Forest and St. Osyth Park, Essex; Savernake Forest, Wilts ; 
