66 LECANO-LBCIDBEI [lBOIDBA 



plane (form ohliterata Leight. Lich. Fl. ed. 3, p. 285), probably from 

 being denuded by water, and also in colour, which is rarely somewhat 

 leaden-coloured, evidently owing to maceration from a sterile crusta- 

 oeous lichen with which it is associated. In its fully developed 

 condition, and with pruinose apothecia, it is var. elegans Th. Fr. 

 in Nov. Act. Reg. Soc. Upsal. p. 307 (1861); this form occurs rarely 

 on the Scottish mountains. The apothecia, common in the British 

 specimens, are at times somewhat crowded and then more or less 

 angulose. When young, they are concave and immersed in the 

 areolae with, as it were, a spurious thalline margin (iorm suboonsentiens 

 Leight. Lich. Fl. ed. B, p. 284). 



Hab. On rooks and stones, granitic and schistose, rarely arena- 

 ceous, in mountainous regions. — Distr. Bare in the North of 

 England, more frequent in Wales and Ireland, and in the central 

 counties of Scotland. — B. M. Cader Idris and Corwen, Merioneth; 

 Snowdon, Carnedd Dafydd, Glyder Mts., Trefriw and Llyn 

 Ogwen, Carnarvon; Abden Burf, Shropshire; Teesdale, Durham; 

 Ravensborrow Crag, Kent River Valley, Westmoreland ; West Water, 

 Fife ; Ben Lawers, Craig Calliach, Crianlarioh, and Glen Falloch, 

 Perthshire; Canlochan, Forfarshire; Baroaldine, Lome, and Ben 

 Cruachan, Argyll ; Glen Callater and Craig Guie, Braemar, Aberdeen- 

 shire ; Glen Nevis, Loohaber, and Invermoriston, Invernessshire ; 

 CuchuUin Hills, Isle of Skye ; Appleoross, Ross ; Loch Shin, Suther- 

 land; Brandon Mt. and Mangerton, Kerry; Kylemore, Doughruagh 

 Mt., Connemara ; Ballynakill, Galway. 



111. L. COroUidia Stirton in Trans. Glasgow Soc. Nat. 1875, 

 p. 88. — Thallus pale or pallid-ashy-grey, somewhat thick, diffract- 

 areolate, rather plane (K + yellow then red). Apothecia black, 

 adnate, large, plane, rugose, sometimes bluish-grey-pruinose with 

 a flexuose obtuse margin ; hypothecium thick, dark-brownish-black ; 

 paraphyses indistinct, brown at the apices ; spores ellipsoid, 0,015- 

 20 mm. long, 0,008-11 mm. thick.— Leight. Lich. Fl. ed. 3, 

 p. 296. Specimen not seen. 



"Perhaps a form of L. Moorecma" (Stirton, I. c). This species 

 seenis from the description to be very nearly identical with L. 

 panceola, of which, except for the absence of cephalodia, it might be 

 only a growth form. 



HoA. On rocks. Collected by Dr. Stirton at Thurso, Caithness. 



112. L. phseenterodes Nyl. in Flora Iviii. p. 363 (1875).— 

 Thallus yellowish-white, firm, areolate. Apothecia plane, margin- 

 ate, varying in size, scattered or crowded, the margin persistent, 

 flexuose, disc bluish-grey, pruinose or naked ; hypothecium dark- 

 reddish, brownish above ; paraphyses slender, yellowish at the 

 tips ; spores ellipsoid, 0,014-22 mm. long, 0,008-12 mm. thick ; 

 hymenial gelatine persistent, deep-blue with iodine. 



In the single specimen in the British Museum, collected and 

 determined by Orombie, the thalline areolse are somewhat scanty and 

 scattered; the apothecia are sometimes proliferous, minute fruits 

 being borne on the disc of older forms. 



Hab. On rooks in alpine situations. — B. M. Ben Lawers, Perth- 

 shire (the only locality). 



