LECAXORA.] LECANO-LKCIDEKT. 4G1 



155. L. parella Ach. Lich. Univ. (1810) p. 370 pro parte ; Nyl. 

 Not. Sallsk. pro F. et Fl. Fenn. Forh. n. ser. v. (1866) p. 135. 

 Thallus subdeterminate or eiFuse, thick ish, granulato-rugose, verru- 

 coso-granulate or rimoso-diffract, whitish or greyish-white (K-, 

 CaCl ); hypothallus white, usually little visible. Apothecia 

 moderate, concave, then plane, at length more or less convex, rugose 

 or verrucose, pale, naked or white-pruinose (epithecium K(CaCl) 

 + reddish), the thalline margin thick, entire (K(CaCl) ) ; spores 

 6-8nae (rarely 2nae), ellipsoid or subglobulose, 0,048-88 mm. long, 

 0,025-46 mm. thick. Cromb. Grevillea, xviii. p. 70 ; Sin. Eng. Fl. 

 v. p. 191 ; Tayl. in Mack, Fl. Hib. ii. p. 137 ; Hook. Fl. Scot. ii. 

 p. 48 ; Cromb. Lich. Brit. p. 54 pro parte ; Leight. Lich. Fl. p. 188 

 pro parte, ed. 3, p. 201 pro parte. L. pallescens a. parella Mudd, 

 Man. p. 155. Rinodina parella Gray, Nat. Arr. i. p. 453. Lichen 

 parellus Linn. Mant. (1767) p. 132; Huds. Fl. Angl. ed. 2, p. 530 ; 

 Light!'. Fl. Scot. ii. p. 814 ; With. Arr. ed. 3, iv. p. 17 ; Eng. Bot. 

 t. 727. Lichenoides leprosum tinctorium, scutellis lapidum cancri 

 fifjura Dill. Muse. 130, t. xviii. f. 10. Pertusaria incarnata Leight. 

 Lich. Fl. ed. 3, p. 235 (cfr. Nyl. Flora, 1883, p. 534). Brit. Exs. : 

 Leight. n. 8 ; Mudd, n. 125 ; Dicks. Hort. Sic. x. n. 23 : Bohl. n. 54 ; 

 Larb. Caesar, n. 75; Lich. Hb. n. 300; Cromb. n. 166. 



The Perelle tfAuveryne of S. France, so that, as observed by Sir J. E. 

 Smith, Linnagus ought to have written the trivial name perellus as in 

 Eng. Bot. &c. The thallus, usually very widely expanded, varies con- 

 siderably in thickness according to habitat, and when lignicolous and 

 corticolous is at times very scanty. The apothecia are numerous, often 

 crowded and anguloso-difform, almost obliterating the thallus ; they are 

 at first depresso-globulose and poriform (the disc being scarcely visible) 

 with very tumid thalline margin, a condition which in some situations 

 seems to be permanent (form porinoides Uromb.). Lichen tumidulus Pera. 

 Ust. Ann. Hot. xi. (1794) p. ]81, with shields crowded, tumid, the 

 margin thickish (nan Ach. Lich. Univ. p. 371), is only a corticolous (also 

 saxicolous) condition (var. tumidula Cromb. Lich. Brit. p. 54 ; Leight. 

 Lich. Fl. p. 189, ed. 3, p. 202), not to be distinguished even as a form. 



Hob. On rocks, walls, and trunks of trees, rarely on old pales, from 

 maritime to subalpine tracts. Distr. General and common in Great 

 Britain and the Channel Islands ; no doubt also in Ireland. B. M. : 

 Boulay Bay, Island of Jersey ; Chateau Point, Island of Sark. Greenwich 

 Park and near Tunbridge* Wells, Kent; Ardingly Rocks, Peasemarsh, 

 and near Hastings, Sussex ; Penzance, Duloc, and St. Issey, Cornwall ; 

 near Tenby, Pembrokeshire ; Barmouth, Merionethshire : Llandyssil, 

 Cardiganshire ; Xant Francon, Carnarvonshire ; Bardon Hill, Leicester- 

 shire: near Shrewsbury, Shropshire; Ay ton, Cleveland, Yorkshire; 

 Eglestone, Durham ; St. Bees and Bassenthwaite, Cumberland ; Choller- 

 ford, Northumberland. Arthur's Seat and Meadowbank Woods, Edin- 

 burgh ; West Water, Fifeshire ; Barcaldine and Ballachulish, Argyle- 

 shire ; Sidlaw Hills and Baldovan, Forfarshire ; Ben Lawers, Aberfeldy, 

 and Craig Tulloch, Blair Athole, Perthshire ; Portlethen and Cove, Kin- 

 carJineshire ; Morrone, Glen Callater, and Glen Dee. Braemar, Aberdeen- 

 shire ; Glen Nevis, Lochaber, Inverness-shire ; Applecross, Ross-shire. 

 Aunemount near Cork, and Kilbrittain near Bandon, co. Cork ; Killarney, 

 co. Kerry. 



