56 LECANO-LECIDEEI [lECIDEA 



Flotow points out that the apothecia, when moistened, appear 

 paler and transparent, owing to the pale hypothecium, surrounded by 

 a dark ring. 



Hab. On rocks. — Distr. Eare in the Channel Islands, Wales and 

 central England. — B. M. Between Rozel and Boulay Bay, Jersey ; 

 Lyth Hill, Shropshire. 



86. L. asema Nyl. in Flora Iv. p. 356 (1872).— Thallus effuse, 

 thin, unequal, somewhat scattered, whitish (K — , CaCl — ). 

 Apothecia small, plane, often subplicate, thinly margined, black 

 or livid-black ; hypothecium reddish or reddish-brown ; para- 

 physes concrete ; epithecium glaucescent ; spores ellipsoid 

 0,013-16 mm. long, 0,006-8 mm. thick ; hy menial gelatine 

 bluish then tawny-wine-coloured with iodine. — Cromb. in Journ. 

 Bot. xi. p. 134 (1873) ; Leight. Lich. Fl. ed. 3, p. 275. 



Closely allied to L. sublatypea, but differs in the form of the 

 apothecia, the colours of the hypothecium and epithecium, the larger 

 spores and the reaction of the hymenial gelatine. 



Hab. On arenaceous and schistose rocks in maritime districts. — 

 Distr. Found only very sparingly in the Channel Islands and the 

 S.W. Highlands of Scotland. — B. M. Barcaldine, Argyll. 



87. L. leucophsea Nyl. in Flora liii. p. 35 (1870).— Thallus 

 indeterminate, thinnish, verrucose-areolate, the areolae more 

 or less convex, greyish (K — , CaCl — ); hypothallus black. 

 Apothecia small, adnate or appressed, plane and thinly margined, 

 reddish-brown, dark-purplish or livid-black, within whitish, the 

 margiii often paler, at length excluded ; paraphyses brown or 

 dark-brown at the apices ; hypothecium pale ; spores ellipsoid, 

 0,009-14 mm. long, 0,004-8 mm. thick ; hymenial gelatine pale- 

 bluish, the asci tawny-wine-coloured, with iodine.^ — Lecanora 

 leucophsea Cromb. Lich. Brit. p. 51 (1870) ; Leight. Lich. Fl. 

 p. 194; ed, 3, p. 178; var. conglobata Cromb. in Journ. Bot. 

 xi. p. 134 (1873); Leight. II. c. Biatora leucophsea Floerke ex 

 Koerb. Syst. Lich. Germ. p. 194 (1855). Lecanora leucophseiza 

 Nyl. in Flora Ivii. p. 308 (1874) ; Leight. Lich. Fl. ed. 3, p. 178. 



Exsicc. Cromb. n. 63. 



Sometimes the thallus is more massive and scattered, with the 

 apothecia convex, difform and tuberculate ; it is then var. congoblata 

 Cromb. The apothecia are occasionally crowded together. 



Hab. On subalpine rocks. — Distr. Plentiful where it occurs in the 

 hilly districts of Wales, N. England, Scotland and W. Ireland. — B. M. 

 Near Llyn Aran, Dolgelly, Barmouth and Aran Mawddwy, Merioneth ; 

 Snowdon and Carnedd Dafydd, Carnarvonshire ; High Force, Teesdale, 

 Yorkshire ; Black Lot, Westmoreland ; Portlethen, Kincardineshire ; 

 Craig Tulloch, Blair Athole, Ben Lawers, Perthshire ; Achosragan 

 Hill, Appin, Argyll ; Morrone and Craig Guie, Braemar, Aberdeen- 

 shire ; near Kylemore and near Lough Mask, Connemara, Galway. 



88. L. leucophaBOides Nyl. in Flora liii. p. 35 (1870). — 

 Thallus areolate-gi'anulose, the areolae smooth, plane or somewhat 



