lecidea] lecideace^ 2 1 



among the Biatoras. The apothecia, numerous but discrete, are in a 

 very young state thinly margined and vary in size from subminute 

 to submoderate, in which latter case it is forma major Cromb. in 

 Leight. I. c. 



Hah. On rocks, chiefly schistose, usually near water, in moun- 

 tainous regions. — Distr. Only in Wales, on the Grampians, Scotland, 

 and in W. Ireland. — B. M. Cader Idris, Merioneth ; Plinlimmon, 

 Cardiganshire ; Nant Francon, Llyn Clwyd and Snowdon, Carnarvon- 

 shire ; Ben Cruachan, Argyll ; Ben Lawers, Perthshire ; Morrone, 

 Braemar, Aberdeenshire ; Mangerton, Kerry ; Delphi and Doughruagh 

 Mts., Connemara, Gal way. 



21. L. lithophiliza Nyl. in Flora li. p. 473 (1868).— Thallus 

 subdeterminate, thinnish, firm, unequally flattened, areolate- 

 diffract or areolate-rimose, greyish or greyish- white (Kf-f 

 yellowish, CaCl — ). Apothecia submoderate, innate, somewhat 

 plane or convex, immarginate, brownish or brownish-black, white 

 within, bounded beneath by a thin black line ; paraphyses 

 moderate, lurid-brownish at the apices ; hypothecium with the 

 middle layer chalky-white, opaque (not hyaline), the lower con- 

 ceptacular layer thin, black ; spores oblong, 0,009-17 mm. long, 

 0,0035-45 mm. thick ; hy menial gelatine bluish with iodine. — 

 Cromb. in Journ. Bot. vii. p. 106 (1869) & Lich. Brit. p. 66; 

 Leight. Lich. Fl. p. 286 ; ed. 3, p. 292. 



Might at first sight be taken for a variety of L. Uthophila, but 

 differs in the deeply-cracked thallus, and its chemical reaction, as 

 also in the immarginate, innate apothecia, with their longer spores. 

 Nylander however rightly regards it as a Biatora near the preceding 

 species. The apothecia are numerous and at times subconfluent. 



Hah. On schistose rocks and walls in maritime and mountainous 

 districts. — Distr. Only sparingly in N. Wales, N. England, and among 

 the Grampians, Scotland. — B. M. Near Hexham, Northumberland ; 

 Garth, Dolgelly, Merioneth ; Crianlarich, Ben Lawers, and Craig 

 Tulloch, Perthshire ; Portlethen, Kincardineshire. 



22. L. Gagei A. L. Sm. — Thallus effuse, thickish, smooth, 

 rimulose-difFract, cream-coloured or brownish-white (K-f-yellow, 

 CaCl — ). Apothecia moderate, at first immersed, plane, with 

 thin entire margin, at length superficial, somewhat convex and 

 immarginate, brownish-red, pale within ; paraphyses slender, 

 not well discrete, brownish at the apices ; spores ellipsoid, 

 0,018-22 mm. long, 0,008-10 mm. thick ; hy menial gelatine 

 bluish then tawny-wine-red with iodine. — L. Taylori Mudd Man. 

 p. 199 (1861). Leight. Lich. Fl. p. 291; ed. 3, p. 296. L. 

 Idsvigata Nyl. in Cromb. Lich. Brit. p. 65 (1870). Lichen Ga'jei 

 Sm. Engl. Bot. t. 2580 (1814), young state. Verrucaria Gagei 

 Borr. ex Hook, in Sm. Engl. Flora v. p. 153 (1833). B'seorayces 

 anomalus Tayl. in Mackay Fl. Hib. ii. p. 79 (1836). Biatora 

 Taylori Salw. in Trans. Penzance Nat. Hist. Sec. 1853, p. 144. 



Exsicc. Leight. n. 283. 



