lecidea] lecideace^ 69 



rimulose, crowdedly sorediose, greyish ; the soredia thin, plane, 

 rotundate (K — , CaCl — , medulla I + bluish) ; hypothallus 

 blackish. Apothecia large or submoderate, plane, margined, 

 black, bluish-grey-pruinose ; paraphyses moderate or thickish ; 

 epithecium brownish ; hypothecium brownish-black ; spores fusi- 

 form-ellipsoid, 0,015-22 mm. long, 0,007-9 mm. thick; hymenial 

 gelatine, as also the asci, bluish with iodine. — Cromb. in Journ. 

 Bot. xiii. p. 141 (1875); Leight. Lich. Fl. ed. 3, p. 305. 

 Exsicc. Mudd n. 181 ; Johns, n. 349. 



Differs from L. contigua in the peculiar soredia, the thicker para- 

 physes, and the reactions with iodine. The hypothallus limits the 

 thallus and is occasionally elsewhere visible. In the few British 

 specimens the apothecia are usually somewhat scattered. The spermo- 

 gones have the spermatia straight, 0,006-8 mm. long {fide Nyl. Pyr. 

 Or. Obs. Nov. p. 68 (1891)). 



Hah. On rocks, gneissic and schistose, in upland hilly situations. — 

 Distr. Only a few localities in W. and N. England, N. Wales, and 

 the S. Grampians, Scotland. — B. M. Malvern Hills, Worcestershire ; 

 Dolgelly, Merioneth ; Langbaurghrigg, Cleveland, Yorkshire ; The 

 Trossachs, Perthshire. 



Form depauperata Cromb. MS. — Thallus thin, nearly esori- 

 diose, greyish or glaucous- white, the areolae dispersed ; hypothallus 

 predominating. 



Probably only a less developed state with a few very small soredia 

 here and there visible. The apothecia are but little pruinose. It 

 seems to connect the type with form esorediza Nyl. ex Lamy in Bull. 

 Soc. Bot. Fr. XXV. p. 450 (1878). 



Hab. On calcareous rocks in a mountainous district. — B. M. 

 Twelve Pins, Connemara, Gal way (the only locality). 



115. L. tenebrans Nyl. in Flora lix. p. 309 (1876).— Thallus 

 determinate, continuous, rimulose, leaden-greyish or dark-leaden- 

 coloured (K — , CaCl — , medulla partly I -f bluish) ; hypothallus 

 black. Apothecia moderate in size, plane and thinly margined, 

 then convex and immarginate, black, concolorous w^ithin ; para- 

 physes slender, dark at the apices ; hypothecium thick, black ; 

 spores ellipsoid, 0,018-24 mm. long, 0,010-13 mm. thick; 

 hymenial gelatine and asci persistently deep-blue with iodine. — 

 Cromb. in Grevillea v. p. 28 ; Leight. Lich. Fl. ed. 3, p. 303. 



Perhaps, as Nylander says, only a subspecies of L. contigua, 

 differing chiefly in the colour of the thallus and the reaction of the 

 hymenial gelatine. In the two specimens seen the apothecia are here 

 and there several confluent. 



Hah. On schistose rocks in a mountainous region. — B, M. Summit 

 of Doughruagh Mt., Connemara, Galway (the only locality). 



116. L. alboccBrulescens Ach. Meth. p. 52 (1803).— Thallus 

 subdeterminate, thickish, smooth, continuous or at length cracked, 

 opaque, whitish or glaucous (K — , CaCl — ) ; hypothallus 

 blackish. Apothecia moderate in size, appressed, plane, black, 



