BIATORINA] LECIDEACEJE 127 



Hah. On rocks. — Distr. W. England, Wales and W. Ireland, rare. 

 — B. M. Bathanipton Downs, Somerset ; near Towyn, Merioneth ; 

 near Cirencester, Gloucestershire ; Kenvoyle, Connemara, Galway 

 (f. rimoso-areolata). 



Var. erubescens Koerb. I. c. — Thallus thin, effuse, forming 

 white, yellowish or reddish patches. Apothecia innate then 

 adnate, small, dark when dry, reddish-black or brownish when 

 wet, with a blackish margin. — Zeora lenticularis var. erubescens 

 Flot. I. c. Lecidea lenticularis f. rhyparocarpa Nyl. ex Leight. 

 Lich. Fl. ed. 3, p. 336 (1879). 



Hah. On rocks in maritime and upland districts. — Distr. Eare in 

 S. and N. England, the Scottish Grampians and W. Ireland. — B. M. 

 Launceston, Cornwall ; Bilsdale, Yorkshire ; Craig Tulloch, Blair 

 Athole, Perthshire ; Kenmare, Kerry, Kylemore, Connemara, Galway. 



Var. chloropoliza A. L. Sm. — Thallus thin, greyish-green,, 

 unequal or wrinkled or almost evanescent. Apothecia often 

 somewhat larger.^ — Lecidea lenticularis subsp. chloropoliza Nyl. in 

 Bull. Soc. Bot. Fr. viii. p. 758 (1861) ; Cromb. Lich. Brit. p. 91 ; 

 var. chloropoliza Leight. Lich. Fl. p. 316; ed. 3, p. 336. 



Exsicc. Larb. Lich. Hb. n. 313. 



Characterized by the usually more developed thallus and larger 

 apothecia. 



Hab. On granitic and schistose rocks, very rarely erratic on dead 

 wood in maritime districts. — Distr. Only sparingly in the Channel 

 Islands, N.E. Scotland and W. Ireland. — B. M. Sark; Boulay Bay 

 and near St. Aubin's (lignicolous), Jersey ; Portlethen and Cove, 

 Kincardineshire ; Killree, Clare. 



29. B. rhypodiza A. L. Sm. — Thallus indeterminate, thin or 

 very thin, subgranulate, brownish-black. Apothecia small, plane, 

 thinly margined, blackish ; paraphyses rather thick, brown at 

 the thickened clavate apices ; perithecium brown ; hypothecium 

 colourless ; spores oblong, 0,014-16 mm. long, 0,005-6 mm. 

 thick ; hymenial gelatine bluish then wine-reddish with iodine. — 

 Lecidea rhypodiza Nyl. in Flora Ixiv. p. 5 (1881) ; Cromb. in 

 Grevillea x. p. 23. 



Resembles in outward appearance f. nigricans of the preceding 

 species, but differs in the form of the paraphyses and larger spores. 

 Spermogones have not been seen. 



Hab. On a schistose rock in an alpine situation. — B. M. Summit 

 of Craig Calliach, Perthshire (the only locality). 



30. B. chalybeia Mudd Man. p. 180 (1861).— Thallus sub- 

 efFuse, thin, continuous or minutely rimulose, dark-grey or 

 leaden-black (K — , CaCl — , medulla I — ) ; hypothallus very thin, 

 black. Apothecia small, sessile, plane or slightly convex, 

 margined, black, the margin thin, entire ; hypothecium thickish, 

 brownish-black ; paraphyses thickish, black at the clavate apices ; 

 spores oblong, ellipsoid, thinly 1-septate, minute, 0,007-0,010 mm. 



