354 LICHEN ACEI. [LECANORA. 
Hab. On rocks, boulders, and walls, sometimes on flints, tiled roofs, 
rarely on oak pales, in maritime and upland districts—Distr, General, 
though 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 of Guernsey; Island of Sark. Thetford 
Warren, Norfolk; Yarmouth, Suffolk; near London, Middlesex; Shiere, 
Surrey ; Penshurst, Kent; near Ryde, Isle of Wight; near Bovey Tracey, 
S. Devon; Penzance, Cornwall; Malvern Hills, Worcestershire; Bed- 
fordshire; Ross, Herefordshire; Twycross, Leicestershire; Bridge of 
Ludlow, Haughmond Hill, Oswestry, and Caer Caradoc, Shropshire ; Bar- 
mouth: and Cader Idris, Merionethshire; Llandyssil, Cardiganshire ; 
Island of Anglesea; Cliffrigg, Cleveland, Yorkshire; near KMglestone, 
Durham; Kendal and Brougham Castle, Westmoreland; Wark and 
Gunnerton Crags, Northumberland. New Galloway, Kirkcudbright- 
shire; Arthur's Seat and Dalmahoy Hill, Edinburgh ; Kyles of Bute, 
Arran; Burntisland, Fifeshire; near Connel Ferry, Argyleshire; Ben 
Lawers, Perthshire ; Forfarshire; Castleton of Braemar, Aberdeenshire. 
Kilcully, near Cork; near Belfast, co. Antrim. 
Var. G3. diffracta Nyl. Lich. Scand. (1861) p. 133.—Thallus 
almost entirely areolato-diffract; areole angular, usually blackish 
at the margins. Apothecia dark-reddish.—Cromb. Grevillea, xviii. 
p. 44._Squamaria saxicola var. diffracta Cromb. Lich. Brit. p. 48 ; 
Leight. Lich. FL. p. 178, ed. 3, p.159. Lichen diffractus Ach. Prodr. 
(1798) p. 63. Squamaria saxicola var. areolata Leight. Mudd, 
Man. p. 129.—Brit. Hxs.: Leight. n. 81; Mudd, n. 93. 
In this variety the radii, which are constantly plane, 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 8.W., W., and N. England, and among the 8, and N. Grampians, 
Scotland.—B. M.: St. Minver, Cornwall; Haughmond Hill, Shropshire ; 
near Ayton, Cleveland, Yorkshire. Ben Lawers, Perthshire ; Craig Guie, 
Braemar, Aberdeenshire. 
Var. y. versicolor Fr. fil. Lich. Scand. (1871) p. 226.—Thallus 
whitish-yellow, more or less suffused with white. Apothecia with 
the thalline margin often white-pulverulent.—Cromb. Grevillea, 
xvill. p. 44.—Squamaria saxicola var. versicolor Leight. Lich. Fl. 
p. 174, ed. 3, p. 159. Lichen versicolor Pers. in Ust. Ann. vii. 
(1794) p. 24. 
Differs 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 petipheral radii visible and scattered over the sub- 
stratum (form distans Cromb.), but this is quite accidental. 
Hab. On calcareous and schistose rocks in maritime and hilly tracts—- 
Distr. Rather sparingly in W. England, Wales, the S.W. Highlands 
and the Central Grampians, Scotland.—B. M.: Chance’s Pitch, Malvern 
Worcestershire ; St. David’s, Pembrokeshire ; Barmouth, Merioneth. 
Island of Lismore, Argyleshire ; Craig Tulloch, Blair Athole, Perthshire. 
