166 LECANO-LECIDEEI [bDELLIA 



ed. 3, iv. p. 9 ; Engl. Bot. t. 582. L. incanus Relh. Fl. Cantab, p. 

 424 (1785) ? Lecidea canescens Ach. Meth. p. 83 (1803) ; Tayl. 

 inMackay Fl. Hib. ii. p. 130; Cromb. Lich. Brit. p. 7S ; Leight. 

 Lich. Fl. p. 302 ; ed. 3, p. 313. Placodium canescens DC. Fl. 

 Franc, ii. p. 379 (1805); Hook, in Sm. Engl. Fl. v. p. 197. 

 Lepidoma canescens S. F. Gray Nat. Arr. i. p. 462 (1821). Biploida 

 canescens Massal. Ric. Lich. p. 86, fig. 177 (1852); Mudd Man. 

 p. 169, t. 3, fig. 60. 



Exsicc. Dicks. Hort. Sice. Brit. n. 24 ; Leight. n. 62 ; Larb. 

 Lich. Hb. n. 104 & Lich. Csesar. n. 33 ; Carroll Lich. Hib. 

 n. 18; Cromb. n. 178. 



Apt at first sight to be confused with Placodium candieans, but 

 well distinguished by the form of the black apothecia and the dark- 

 coloured spores. 



Hab. On old trees, rocks, and walls. — Distr. Frequent in the 

 Channel Islands, England, and Ireland; somewhat rare in Scotland 

 and Wales. — B. M. Huet Bay, Guernsey ; Fliquet Bay, Jersey ; 

 Sark ; I. of Wight ; near Penzance and St. Minver, Cornwall ; 

 Tregantle, Devon ; Netley Abbey and near Lymington, Hants ; 

 Glynde, Beediog Priory, Hurstpierpoint, Aldrington, Angmering, 

 Boxgrove, Ardingly, and near Lewes, Sussex ; near Cheam, Surrey ; 

 Hythe, Lydd, and Penshurst, Kent ; near Hendon, Middlesex ; Dan- 

 bury Park, Ulting, and Walthamstow, Essex ; near Elstree, Herts ; 

 Windsor Great Park, Berks ; Lechlade, Gloucestershire ; Whittington 

 and Norton, Worcestershire ; Gopsall Park and Twycross, Leicester- 

 shire; Dolgelly and Aberdovey, Merioneth; Wimpole Park and 

 Gamlingay, Cambridgeshire ; Ickworth, Suffolk ; Yarmouth and 

 Eaton, Norfolk ; Baston Hill, Lincoln ; PwllheU, Carnarvonshire ; 

 Harboro' Magna, Warwickshire ; Clifton Grove, Nottinghamshire ; 

 near Ayton, Cleveland, Yorkshire; Gainsford, Durham; Hexham, 

 Northumberland; Queen's Park, near Edinburgh; Den of Mains, 

 Forfarshire; Nigg, Kincardineshire; Ballachulish, Argyll; Dromo- 

 land, Agharda and Middleton, Cork ; Carrigogunnel, Limerick ; 

 Coolmore, Donegal. 



2. B. epigsea Tuckerm. Gen. Lich. p. 185 (1872).— ThaUus 

 whitish, orbicular, radiate-plicate at the circumference, farinose, 

 sometimes reduced to scattered squamules. Apothecia black, sub- 

 sessile, plane, becoming convex, whitish- or bluish-pruinose, the 

 margin thin, at first prominent, at length disappearing ; hypo- 

 thecium brown or blackish-brown ; paraphyses loosely coherent, 

 often septate, dark-brownish-black at the apices ; spores elliptical, 

 obtuse at the ends, sometimes constricted in the middle, 0,016-21 

 mm. long, 0,007-9 mm. thick. — Lichen epigaeus Pers. in Ust. 

 Ann. vii. pp. 25, 155 (1794). Lecidea epigxa Schser. Spicil. 

 Lich. Helv. p. 118 (1828). 



Exsiec. Larb. Lich. Hb. n. 312. 



Somewhat similar to the preceding, but differs in the non-sorediate 

 thallus and the larger spores. 



Hah. On the ground. — B. M, Thetford Warren, Norfolk, 



