LECANORA..] LECANO-LECIDKKI. 439 



however, are plane and margined, it is, like the preceding form, confluent 

 with the type. 



Hub. On rocks, boulders, and walls in upland and subalpine districts, 

 Distr. Local in N. Wales, W. and N. England, and among the Gram- 

 pians, Scotland. B. M. : Dolgelly, Merionethshire ; near Oswestry, 

 Shropshire ; Guisboro' and Ay ton Moors, Cleveland, Yorkshire. Ben 

 Lawers and Craig Tulloch, Perthshire; Morrone, Braemar, Aberdeen- 

 shire. 



Subsp. L. intricata Nyl. Flora, 1872, p. 251. Thallus deter- 

 minate, thinnish or submoderate, areolato-diffract, subeffigurate at 

 the circumference, yellowish- white or greyish-yellow (K + yellowish, 

 CaCl ); hypothallus black, often limiting the thallus. Apothecia 

 small, adnate, plane or somewhat convex, lecanorine, or at length 

 often sublecideine, variable in colour, sordid-pale-testaceous, brown- 

 ish, olive or blackish ; spores ellipsoid or oblongo-ellipsoid, 0,010- 

 12 mm. long, 0,005-7 mm. thick. Cromb. Grevillea, xviii. p. 69. 

 Lecanora intricata Tayl. in Mack. Fl. Hib. ii. p. 137 ; Leight. Lich. 

 Fl. p. 198, ed. 3, p. 181. L.polytropa e.intricata, Mudd,Man. p. 152; 

 Cromb. Lich. Brit. p. 52. Lecidea intricata 8m. Eng. Fl. v. p. 185. 

 Lichen intric'itus Schrad. Journ. Bot. (1881) p. 72. Lichen poly- 

 tropus Eng. Bot. t. 1264, two upper figs. Lecanora polytropa y. 

 alpigena Mudd, Man. p. 152, is merely a state of this. Brit. Exs. : 

 Leight. n. 153; Mudd, n. 119. 



Well distinguished as a subspecies by the more distinct hypothallus 

 and the colour of the usually lecanorine apothecia, which, however, are 

 at length often lecideino-biatorine and immarginate. A lignicolous con- 

 dition, differing from the type merely in the thallus being more effuse and 

 the hypothallus less distinct, is rarely met with in the Highlands of 

 Scotland. 



Jfab. On rocks, boulders and walls, rarely on old palings, in maritime 

 and mountainous districts. Distr. Somewhat local and much less com- 

 mon than the type, in N. Wales, N. England, among the Scottish Gram- 

 pians, and in W. Ireland. B. M. : Barmouth and Dolgelly, Merioneth- 

 shire ; Llyn Geirionydd, Carnarvonshire ; Bodbury Ring, near Church 

 Stretton, Shropshire ; Ingleby and Kildale, Yorkshire ; Eglestone, 

 Durham ; Staveley, Westmoreland ; Swinhope, Northumberland. Crian- 

 larich, Killin, Ben Lawers, Craig Tulloch, Perthshire ; Portlethen, 

 Kincardineshire; Morrone, Braemar, Aberdeenshire ; Ben Nevis, Inverness- 

 shire. Dunkerron, co. Kerry. 



Var. ft. leptacina Nyl. ex Stiz. St. Gall. Nat. Ges. 1882, p. 351. 

 Thallus small, thin, granulato-squamulose, straw-coloured, the 

 granules smooth, crenate (K + yellowish, CaCl ). Apothecia 

 moderate, plane, olive or blackish, obsoletely yellowish-suffused, the 

 thalline margin persistent, usually crenulate ; spores 0,01012 mm. 

 long, 0,005-6 mm. thick. Cromb. Grevillea, xviii. p. 69. Lecanora 

 varia subsp. leptacina Cromb. Journ. Bot. 1873, p. 134 ; Leight. 

 Lich. Fl. ed. 3, p. 177. Lecanora leptacina Somm. Lapp. Suppl. 

 (1826) p. 96. Lecanora varia form terrestris Cromb. Lich. Brit, 

 p. 52 ; Leight, Lich. Fl. p. 193. 



