lecidea] lecideace^ 71 



Two forms are distinguished: vav. fuscella Mudd (Man. p. 209 (1861)) 

 with a thin brown thallus looking like a dark stain on the sandstone, 

 and f. gcographica Cromb. MS. which is limited and intersected by 

 the black hypothallus. 



Hah. On arenaceous rocks and flints, very rarely lignicolous, in 

 maritime and upland situations. — Distr. Only a few localities in 

 England and Ireland ; not seen from Scotland. — B. M. Lydd Beach, 

 Kent (f. geograpliica) ; Shiere, Surrey ; Launceston, Cornwall ; The 

 Downs, Lewes, near Hastings, Patcham, and Newhaven, Sussex ; 

 Lyndhurst Moor, Hants ; Oaksey, Wiltshire ; Hale's End, Malvern, 

 Worcestershire ; Larch Bank, near Ayton, Cleveland, Yorkshire ; 

 Ballinhassig, near Cork ; Kylemore, Galway. 



Var. meiospora Olivier Exp. Syst. ii. p. 113 (1901). — Thallus 

 whitish-grey, areolate or scattered, thicker than in the type. Apo- 

 thecia often arranged in lines, black, plane, marginate, larger 

 than in the type ; spores oblong-elliptical, 0,012-16 mm. long, 

 0,006-7 mm. thick.— L. contigua var. meiospora Nyl. Lich. Scand. 

 p. 125 (1861) ; Leight. Lich. Fl. ed. 3, p. 302. 



Exsicc. Larb. Lich. Hb. n. 310. 



Hah. On arenaceous and calcareous rocks in upland situations.— 

 Distr. Only a few localities in central England, Scotland, and Ireland. 

 — B. M. Bradgate Park, Leicestershire ; Wellingdale Doe, Suffolk ; 

 Crianlarich, Perthshire; Doughruagh Mt., Connemara, Galway. 



118. L. sympathetica Tayl. ex Leight. Lich. Fl.p.257 (1871). — 

 Thallus pale-brown or creamy-white, subdeterminate, tartareous, 

 plane, rimose-areolate, furfuraceous. Apothecia black, numerous, 

 small, subinnate rugose, the margin indistinct, rugose ; hypo- 

 thecium thick, black or brownish-black ; paraphyses indistinct ; 

 the epithecium brown; spores ellipsoid, 0,011 mm. long, 0,006 

 mm. thick. — Leight. op. cit. ed. 3, p. 249. 



Leighton gives the thalline reactions as K -f yellow, CaCl -f j'ellow, 

 but when the test was applied to the type at Kew, there was no 

 colour produced. It differs from L. crustulata in the more developed 

 tartareous thallus, in the apothecia which are innate at first, and in 

 the smaller spores. 



Hah. On sandstone. — Distr. Found in England, Wales, and 

 Ireland. 



119. L. prominula Borr. in Engl. Bot. Suppl. 2687, hg. la 

 (1831). — -Thallus pale-tawny-brown, thin, minutely granular 

 (K -f yellow, CaCl -f yellow). Apothecia black, small, numerous, 

 crowded, sessile plane, with an obtuse entire margin ; hypothecium 

 colourless or yellowish-brown, the lateral excipulum blackish- 

 brown ; paraphyses rather lax, pale, dark-brown at the apices ; 

 spores elliptic-oblong, 0,011-15 mm. long, 0,006-9 mm. thick; 

 hymenial gelatine blue then dirty-violet with iodine. — Hook, in 

 Sm. Engl. Fl. v. p. 175; Mudd Man. p. 203 (spore measurements 

 too small) ; Leight. Lich. Fl. p. 259, ed. 3, p. 255. 



