LECAKORA.] LECANO-LECIDEEI, 379 



3!t. L. atroflava Nyl. in Zwach Lich. Heidelb. (1813) p. 83. — 

 Thallus siibett'use, sniootli, thin, rimo<o-diffract, continuous, um- 

 brine-blackisli (K — ). Apofhecia small, plane, biatorine, ochracco- 

 ferruginous (K + purplish), the margin entire, paler; spores ellip- 

 soid, polari-bilocular, (t,nOU-ll mm. long, 0,005-0 mm. thick. — • 

 Cromb. (jirevillea, xviii. p. 45. — Lecidea atrojlava Sm. Eng. Fl. v. 

 p. 18o ; Turn. Linn. Traus. ix. (1808) p. 142, t. 11. f. 2. Lichen 

 atniflnvus Eng. liot. t. 2009. Lecanora scotophica Nj'l. Flora, 1876, 

 p. 232. Lci-aiiora ftrrmjinea var. scutoplaca Leight. Lich. Fl. ed. 3, 

 p. 2o9.— iJ/-i«. Exs. : Larb. Lich. Hb. n. 335. 



Near to L. ceesiuntfa, but apparently a distinct species. The thallus, 

 ui^ually more or le>s eHu<e, is at tiines when associated with other crus- 

 taceoii^ lichens (e. g. Lecanora campestris) well determinate. The apo- 

 thecia are numerous and crowded, whence it has often been confounded 

 with var. holucarjm of L. pyracea. 



Hah. On siliceous rocks, usually exposed flints, in maritime, rarely- 

 upland tracts. — D^str. Local and scarce in S. and E. Englar.d, N. A\'ales, 

 and in N.W. Ireland.— B. M. : Ryde, L^le of Wight; Beechy Head and 

 the Downs, Sussex : Lyddbeaeh, Kent ; Thetford "SVarren, Norfolk. 

 Barmouth, Merionethshire ; Island of Anglesea. Near Kyiemore, Con- 

 uemara, co. Galway. 



40. L. Tnmeriana Xyl. ex Cromb. Journ. Bot. 1876, p. 360. — 

 Thallus thin, areolato-rimose or diffract, the areolae verrucoso- 

 unequal, dark-grey or brownish-black (K — ). Apothecia small, 

 plane or somewhat convex, biatorine, reddish-yellow, the margin 

 thick, entire, persistent, paler yellow (epithecium K + purplish); 

 spores ellipsoid, polari-bilocular, 0,011-16 mm. long, 0,007-10 mm. 

 thick. — Leight. Lich. Fl. ed. 3, p. 209. — Lecidea turneriana Ach. 

 Lich. Univ. (1810) p. 206. 



Has the aspect of i. pyracea,h\\i differs in the culour of the thallus and 

 apothecia, and especially in the thicker spores. The thallus varies fmni 

 dark-grey to deep-brown, pai^sing into black; but in our specimens it is 

 hut sparingly visible. The apothecia are usually scattered, though here 

 and there a few are crowded, the epithecium being at times of a darker 

 colour. 



Tfab. On rocks in maritime districts. — Distr. Seen only sparingly from 

 S. AVales, N.W. England, and X.W. Ireland.— B. M. : St. David'sJ Pem- 

 brokeshire ; Bairowmuuth, "Whitehaven, Cumberland. Kyiemore and 

 Killerey Bay, Connemara, co. Galway. 



41. L. albolutescens Xyl. Flora, 1851, p. 177. — ThaUus thin, 



subfarinaccous, continuous or somewhat scattered, whitish (K ). 



Apothecia moderate, prominent, orange-coloured, subbiatorine, thickly 

 margined, the margin externally thalline and Avhitish, but orange 

 on the upper portion, epithecium unequal (K-(- purplish); spores 

 ellipsoid, polari-bilocular, 0,015-18 mm. long, 0,007-10 mm. thick 

 the loculi large. — Cromb. Grevillea, x. p. 22. 



Not to be confounded with L. pyracea, from which it at once differs in 

 the larger, thickly margined apothecia and the larger spores. As observed 



