LECANORA. | LECANO-LECIDEET. 461 
155. L. parella Ach. Lich. Univ. (1810) p. 370 pro parte; Nyl. 
Not. Sallsk. pro F. et Fl. Fenn. Férh. n. ser. v. (1866) p. 135.— 
Thallus subdeterminate or effuse, thickish, 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 
6-8ne (rarely 2ne), ellipsoid or subglobulose, 0,048-88 mm. long, 
0,025-46 mm. thick.—Cromb. Grevillea, xviii. p. 70; Sm. Eng. Fl. 
v. p. 191; Tayl. in Mack, Fl. Hib. ii. p. 137; Hook. FI. Scot. ii. 
p. 43; 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. 182; Huds. Fl. Angl. ed. 2, p. 530 ; 
Lightf. Fl. Scot. ii. p. 814; With. Arr. ed. 3, iv. p. 17; Eng. Bot. 
t. 727. Lnchenoides leprosum tinctorium, scutellis lapidum cancri 
Jigura 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. 0.8; Mudd, n.125; Dicks. Hort. Sic.x.n. 28: Bohl.n. 54; 
Larb. Cesar. n. 75; Lich. Hb. n. 300; Cromb. n. 166. 
The Perelle d’ Auvergne of 8. France, so that, as observed by Sir J. E. 
Smith, Linneus ought to have written the trivial name perelius 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 Cromb.). Lichen tumidulus Pers. 
Ust. Ann. Bot. xi, (1794) p. 181, with shields crowded, tumid, the 
margin thickish (non 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. 
Hab. 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; Nant Francon, Carnarvonshire ; Bardon Hill, Leicester- 
shire; near Shrewsbury, Shropshire; Ayton, 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, Areyle- 
shire ; Sidlaw Hills and Baldovan, Forfarshire; Ben Lawers, Aberfeldy, 
and Craig Tulloch, Blair Athole, Perthshire; Portlethen and Cove, Kin- 
cardineshire ; Morrone, Glen Callater, and Glen Dee, Braemar, Aberdeen- 
shire; Glen Nevis, Lochaber, Inverness-shire ; Applecross, Ross-shire, 
Annemount near Cork, and Kilbrittain near Bandon, co. Cork; Killarney, 
co. Kerry. 
