150 LECANO-LECIDEEI [bACIDIA 



Hah. Overspreading decayed mosses on turfy soil in mountainous 

 districts.— Dis^r. Bare in Wales, S.W. ajid N.W. Ireland.— B. M. 

 Barmouth, Merioneth ; Glyder, Carnarvonshire ; near Dunkerron and 

 Mangerton, Kerry ; Barnageeha and Doughruagh Mt., Galway. 



Form thiopsora A. L. Sm. — Thallus -n-hite-sulphureous. 

 Apothecia often 2-4^coniiate, subconvex, naked or greyisli- 

 yeUow-suffased ; otherwise as in the type. — Lecidea thiopsora 

 Nyl. in Flora Ux. p. 573 (1876) ; Cromb. in GreviUea v. p. 106 ; 

 Leight. Lich. Fl. ed. 3, p. 354. L. pulvinata f. thiopsora Nyl. 

 in Flora Ixii. p. 223 (1879) ; Cromb. in Grevillea viii. p. 30. 



Exsiec. Larb. Lich. Hb. n. 185. 



Hob. On mossy ground among rocks in a mountainous region. — 

 B. M. Doughruagiti Mt., Connemara, Galway (the only locality). 



2. B. polysita A. L. Sm. — Thallus dark-grey or pale-greyish- 

 brown, tMckish, squamulose, the squamules crenulate or some- 

 times slightly concave (K — , CaCl— ). Apothecia brown or 

 brownish-black, sessile, somewhat plane, immarginate, at length 

 convex and prominent ; hypothecium thick, reddish-yellow, brown 

 or blackish-brown in a thick section ; paraphyses distinct, 

 colourless at the apices and not clavate ; spores acicular or 

 slenderly clavate, straight, 3— 11 -septate; hypothecium and lower 

 portion of the hymenium K-f-purple. — Lecidea polysita Stirton 

 in Scott. Nat. iv. p. 28 (1874) ; Leight. Lich. Fl. ed. 3, p. 368. 

 Specimen not seen. 



Hob. On old dead bark. — Dist. Bare in AV. Scotland (Ben Brecht, 

 Ai-gyU). 



3. B. rosella De Not. in Giom. Bot. Ital. ii. p. 189 (1846).— 

 Thallus ejQFuse, thin, unequal or subgranulose, greyish-green or 

 greyish-white. Apothecia moderate, sessile, concave, then plane 

 with thick obtuse paler margin, at length convex, immargi- 

 nate, rose- or flesh-coloured, slightly pruinose, whitish within ; 

 hypothecium colourless ; paraphyses slender, loosely coherent ; 

 epithecium granulose, yellowish ; spores acicular, colourless, 

 0,068-98 mm. long, 0,0045-50 mm. thick ; hymenial gelatine 

 deep blue then sordid-violet with iodine. — Mudd Man. p. 181. 

 Lichen rosellus Pers. in Ust. Ann, vii, p. 25 (1794) (non Engl. 

 Bot. t. 1651, vide Part i. p. 419). Lecidea rosella Ach. Meth. 

 p. 57 (1803) ; S. F. Gray Nat. Arr. i. p. 474; Cromb. Lich. Brit, 

 p. 73 ; Leight. Lich. Fl. p. 341 pro parte ; ed. 3, p. 369 pro 

 parte. L. alabastrina Ach. Lich. Univ. p. 190 (1810); Hook. 

 Fl. Scot. ii. p. 40 & in Sm. Eng. Fl. v. p. 184; S. F. Gray I. c. 



Easily recognized by the colour of the apothecia, which however 

 at times become rather darker in age ; though numerous they ai'e 

 somewhat scattered, especially when the thallus is less crowdedly 

 granulose. In other respects it is intimately related to the following 

 species. 



Hah. On the trunks of trees in maritime and upland districts. — 

 Distr. Very local and scarce in S.. T\'., and N. England (Eipon, 



