LECANORA. | LECANO-LECIDEET. 421 
Leicestershire; Malvern Hills, Worcestershire ; Pwllheli, Carnarvon- 
shire; Island of Anglesea; Haughmond Hill, Shropshire; Cliffrigg, 
Cleveland, and Ribbledale, Yorkshire ; near Milnthorpe, Westmoreland ; 
Swinhope, Northumberland ; Catterleen, Cumberland. New Galloway, 
Kirkeudbrightshire; Kyles of Bute; Barcaldine and Ben Cruachan, 
Argyleshire ; Killin, Perthshire; near Dundee, Forfarshire; Portlethen, 
Kincardineshire ; Castleton of Braemar, Aberdeenshire. Lambay Island 
and Kinsale, co. Cork. 
Form 1. decussata Cromb. Grevillea, xviii. (1890) p. 68.— 
Thallus white or greyish-white, finely marked throughout with 
black hypothalline (?) lines. Apothecia as in the type, with con- 
colorous thalline margin. 
Looks at first sight as if almost referable to L. calcarea, but has the 
reactions of this species. In our two British specimens the spermogones 
are very abundant, giving the thallus a black-punctate appearance. It 
seems to be the plant alluded to by M. Lamy, Lich. Mt. Dor. p. 75. 
Hab, On rocks in maritime and upland districts.—Déstr. Very spar- 
ingly in the Clannel Islands and N, England—B. M.. Chateau Point, 
Asland of Sark. Gunnerton Crags, Northumberland. 
Form 2. complanata Leight. Lich. F). ed. 3 (1879) p. 205.— 
Thallus and apothecia in an uniform plane, the apothecia innate.— 
Cromb. Grevillea, xviii. p. 68. 
Differs merely in the thallus andapothecia being smoothed down to the 
same level, but is connected with the type by intermediate states, and no 
doubt depends upon the nature of the substratum. Leighton describes 
the apothecia as blackish ; but this is accidental, and in other specimens 
referable to this form they are of the normal colour. 
Hab. On slate-rocks in maritime districts Distr. Only sparingly in 
S. Wales, the W. Highlands of Scotland, and 8.E. Iveland.—B. M.: Near 
Towyn, Pembrokeshire. Ballachulish, Argyleshire. Kinsale, co. Cork. 
Var. (.inflexa Johns. ex Cromb. Grevillea, xviii. (1890) p. 68.— 
Thallus rimoso-areolate, greyish-white. Apothecia plane, crowded ; 
the thalline margin prominent, thickish, snow-white, crenate and 
flexuose, 
A distinct variety characterized by the thalline margin of the apothecia. 
These are for the most part aggregate and become angulose through 
mutual pressure. It is scarcely referable to var. rugosa (Ach.) Fy. fil. 
Lich. Scand. p. 271. 
Hab. On quartzose rocks in an upland district.—Distr. Very local in 
N.W. England.—B, M.: Alston, Cumberland. 
Var. y. Swartzii Nyl. Lich. Scand. (1861) p. 159.—Thallus un- 
equal, rimose or verrucoso-granulate, subradiate or at times byssinu- 
radiate at the circumference. Apothecia subglobose, usually aggre- 
gato-conglomerate, the thalline margin at length evanescent.— 
Cromb. Lich. Brit. p. 50; Leight. Lich. Fl. p. 216, ed. 3, p. 205.— 
