LECIDEa] LECIDEACEaa 41 



52. L. ochraoea Wedd. in M6m. Soc. Sc. Nat. Cherb. xvii. p. 369 

 (1873). — Thallus effuse, very thin, subleprose, slightly rimulose, 

 sordid-whitish, greyish-brown or brownish-ochraceous (K — , 

 CaOl — ), often scarcely visible. Apothecia sessile, small, plane, 

 thinly margined, at length somewhat convex and immarginate, 

 black or brownish-black ; hypothecium dark-brown ; epithecium 

 tawny -brown ; spores ellipsoid, 0,009-12 mm. long, 0,005-6 mm. 

 thick ; hy menial gelatine bluish then wine-red with iodine. — ■ 

 Cromb. in Journ. Bot. xiii. p. 141 (1875) ; Leight. Lich. Fl. ed. 

 3, p. 251. Biatora ochracea Hepp Plecht. Europ. n. 263 (1851). 

 L. subochracea Nyl. Lich. Env. Paris Suppl. p. 5 (1897). 



Exsicc. Larb. Lich. Hb. nos, 64, 137 ; Johns, n. 336. 



Often not rightly discriminated 'from L. fuscorubens. Nylauder, 

 however, I. c, says that its true affinity is with the preceding, from 

 which it differs in the much smaller spores. The thallus is frequently 

 obsolete, when it is form ecrustacea Larb. in Leight. Lich. Fl. I. c. 

 In moist situations the apothecia are reddish-brown. The spermo- 

 gones, rarely visible on our specimens, have the spermatia straight, 

 cylindrical, 0,005-6 mm. long, about 0,01 mm. thick. 



Hab. On calcareous rooks and flints in maritime and upland dis- 

 tricts. — Dist. Occasionally in S. England, the S. Grampians, Scotland, 

 and S. and W.' Ireland. — B. M. Near Lewes, Sussex; Ben Lawers, 

 Perthshire ; Achosragan Hill, Appin, Argyll ; near Cork ; Lough Feagh, 

 Croagh Glen, and near Kylemore, Oonnemara, Galway. 



53. L. turgidula Fr. Sched. Crit. i. p. 10 (1824).— Thallus 

 effuse, very thin, granulose or leprose-pulverulent, whitish (K — , 

 CaCl— ). often evanescent. Apothecia small, plane or convex, 

 immarginate, black, brownish-black, or rarely reddish-brown, 

 naked or slightly bluish-grey pruinose, within pale-whitish or dark ; 

 paraphyses brownish or blackish at the apices; hypothecium 

 pale-brownish or sordid-dark ; spores ellipsoid or ellipsoid-oblong, 

 minute, 0,007—12 mm. long, 0,003-5 mm. thick; hymenial 

 gelatine deep blue then dark violet with iodine. — Mudd Man. 

 p. 201 ; Cromb. Lich. Brit. p. 69 ; Leight. Lich. Fl. p. 263 ; ed. 3, 

 p. 260. 



Exsicc. Mudd n. 171 ; Cromb. n. 83. 



A variable plant as to the thallus, the colours of the apothecia and 

 the paraphyses. The thaUus, usually more or less immersed (hypo- 

 phloeodal), is often in lignicolous specimens entirely obsolete, when 

 the apothecia are erumpent between the fibres of the wood. It is 

 then form erumpens Nyl. in Not. Sallsk. Faun. & Fl. Fenn. iv. p. 232. 

 The apothecia are niunerous and either solitary or congregate. The 

 not unfrequent spermogones are black, with spermatia 0,005-6 mm. 

 long, about 0,001 mm. thick. 



Hab. On old pales, the bark and stumps of felled trees, chiefly flr, 

 in upland wooded situations. — Distr. Occasionally throughout Great 

 Britain, but plentiful where it occurs ; not seen from Ireland. — B. M. 

 Shanklin, Isle of Wight ; Lyndhurst, New Forest, Hants ;. near Bovey 

 Tracey, Devon; Bodmorton, Gloucestershire; Dolgelly, Merioneth; 

 Baysdale, Cleveland, Yorkshire; Glen Fender, Ben Lawers, Glen 



