354 Licnr.XACEi. [lecanora. 



Hah. On rocks, boulders, and walls, sometimes on flints, tiled roofs, 

 rarely on oak pales, in maritime and upland districts. — Distr. General, 

 thouo-h somewhat scarce where it occurs, in the Channel Islands and 

 England; rarer in Scotland and Ireland. — B. M. : Fliquet Bay, Island of 

 Jersey; Vale Castle, Island i.f (Tuerusey; I>land of Sark. Thetford 

 Warren, Norfolk ; Yarmouth, Suftblk ; neai* London, Middlesex ; Shiere, 

 Surrey ; Penshurst, Kent ; near Ryde, Isle uf AMg-ht : near Bovey Tracey, 

 S. Devon ; Penzance, Cornwall ; Malvern Hills, Worcestershire ; Bed- 

 fordshire; Ross, Herefordshire; Twy cross, Leicestershire; Bridge of 

 Ludlow, Haughmond IJill, Oswestry, and Caer Caradoc, Shropshire ; Bar- 

 mouth and Cader Idris, Merionethshire ; Llandyssil, Cardiganshire ; 

 Island of Anglesea ; Cliffi'igg, Cleveland, Yorkshire ; near ]*]glestone, 

 Durham ; Kendal and Brougham Castle, Westmoreland ; Wark and 

 Gunnerton Crags, Northumberland. New Galloway, Kirkcudbiight- 

 shire ; Arthur's Seat and Dalmahoy Hiil, Edinburgh ; Kyles of Bute, 

 Arran ; Burntisland, Fifeshire ; near Connel Ferry, Argyleshire ; Ben 

 Lawers, Perthshire ; Furfarshire ; Castleton of Braemar, Aberdeenshire, 

 Kilcully, near Cork ; near Belfast, co. Antrim. 



Yar. ft. diffi-acta Xyl. Lich. Sc-and. (18G1) p. 133.— Thallus 

 almost entirely areolato-difFract ; areolae angular, usually blackish 

 at the margins. Apotbeeia dark-reddish. — Cromb. Grevillea, xviii. 

 p. 4-1. — Squamaria saxkola var. diffracta Cromb. Lich. Brit. p. 45 ; 

 Leight. Lich. Fl. p. 1 73, ed. 3, p. 159. Lichen dijfractus Acb. Prodr. 

 (1798) p. 63. Squamaria soxicola var. areolata Leight. Mudd, 

 Man. p. I2d.— Brit. Exs. : Leight. n. 81 ; Mudd, u. 93. 



In this variety the radii, which are constantly pi me, are visible only at 

 the immediate circumference, the rest of the thallus being entirely areo- 

 late. The apothecia in our specimens are but sparingly present, with 

 the thalline margin subcrenate and at length nearly obliterated. 



Hab. On rocks in upland and subalpine situations. — Distr. Local and 

 scarce in S.W., W., and N. England, and among the S. andN. Grampians, 

 Scotland. — B. M. : St. Minver, Cornwall ; Haughmond Hill, Shropshire ; 

 near Avton, Cleveland, Yorkshu-e. Ben Lawers, Perthshire ; Craig Guie, 

 Braemar, Aberdeenshire. 



Yar. y. versicolor Fr. fil. Lich. Scand. (1871) p. 220.— Thallus 

 -whitish-yellow, more or less suffused with white. Apothecia with 

 the thalline margin often white-pulverulent. — Cromb. Grevillea, 

 xviii. p. 44. — Squamaria saxicola var. ver.^icohr Leight. Lich. Fl. 

 p. 174, ed. 3, p. 159. Lichen versicolor Pers. in TJst. Ann. ^ii. 

 (1794) p. 24. 



DilFers in the colour of the usually smaller thallus, and in the character 

 of the thalline margin of the somewhat crowded apothecia. Rarely it 

 occurs with only the peiipheral radii visible and scattered over the sub- 

 stratum (form distayis Cromb.), but this is quite accidental. 



Hah. On calcareous and schistose rocks in maritime and hilly tracts. — 

 Distr. Ratlier sparingly in AY. England, Wales, the S.\A'. Highlands 

 and the Central Grampians, Scotland. — B. M.: Chance's Pitch, Malvern, 

 Worcestershire; St. David's, Pembrokeshire; Barnidutli, Alerinneth. 

 I.4and of Lisuiore, Argyleshire ; Craig Tulloch, Blair Athole, Perthshire. 



