LECAXORA.] I.KCAXO-I.KCIDKEI. 445 



violet-red with iodine. — Cromb. Grevillea, xviii. p. 09. — Lecanora 

 aJharieUa Xvl. Bot. Zeit. 1801, p. 333 (nota), cfr. Act. Soc. Linn. 

 Bord.t.xxv."(1864)p. (53 ; Jones, Xat. Hist. Soc. Dublin, 1864, p. 11 U ; 

 Cromb. Lich. Brit. p. 50; Leight. Licb. Fl. p. 229, ed. 3, p. 219. 



Apparoutly a gond subspecies, charaoterized by tbe differences {riven in 

 the thalhis and apothecia. Accordinfr to Nylauder in lift., L. (Atpicih'a) 

 lactea Mass. ISymm. Lich. 185o, p. 26, is scarcely different. The two 

 British specimens seen are fairly typical and well fertile. 



Hub. On calcareous (rarely arenaceous) rocks and mortar of walls in 

 maritime districts. — Distr. Extremely local and scarce in S. England and 

 N.E. Ireland. — B. M. : Isle of Wight, Hampshire ; near Eastbourne, 

 Sussex. Glenarm, co. Antrim. 



Subsp. 2. proteiformisXvl. Flora, 1881, p. 538. — Thallus thickish 

 or somewhat thin, granuloso-verrucose. areolato-difFract or subpnl- 

 verulent, glaucous-grey, greenish-brown or sordid-white. Apo- 

 thecia bialorinc, at first plane and thinly margined, then convex 

 and immarginate, yellowish-brown, reddish-brown or blackish, 

 naked or pruinose ; spores 1-septate, 0,009-12 mm. long, 0,0u3-4 

 mm. thick ; hymenial gelatine bluish with iodine. — Biatora iwolei- 

 fonnis Mass. Sched. crit. (1S55) p. 92. 



Very variable in external appearance, but distinguished bv the smaller 

 spores, which in our specimens are 0,010-11 mm. long, 0,00.35 mm. 

 thick. These were en-oneously referred by me in Journ Bot. Is74, p. 148, 

 to L. lactea (Mass.), to which they are superficially subsimilar. 



Hab. On calcareous rocks and walls in upland tracts. — Distr. Onlv 

 sparingly in W. England. — B. M. : Bathampton Downs, Somersetshire ; 

 near Painswick and Cirencester, Gloucestershire. 



135. L. phseoleucodes Xyl. Flora, 1879, p. 356. — Thallus effuse, 

 deplanate, areolato-diffract, whitish (K — , CaCl— ). Apothecia 

 minute, convex, brown, biatoroid, the thalline margin speedily ex- 

 cluded ; spores 0,016-20 mm. long, 0,0u5 mm. thick ; hymenial 

 gelatine bluish, then wine-red with iodine. — Cromb. Grevillea, viii 

 p. 112. 



Probably distinct from L. eryslbe, to which in the apothecia it is sub- 

 similar, though diHering in the longer spores. The thalline maro-in of 

 the apothecia, which are darker in age, is visible only in their vountr 

 condition. The spermogones, which are common, have the spermatia 

 arcuate, 0,016-20 mm. long, 0,0005 mm. thick. 



Hab. On a calcareous rock in a maritime district. — Distr. Local and 

 scarce in the S.W. Highlands of Scotland. — B. M. : Island of Lismore, 

 Argjdeshire. 



136. L. Hutchinsia Xyl. Flora, 1867, p. 336.— Thallus effuse, 

 thin, rimose or rimuloso-diffract, pale- or yellow-greyish (K — , 

 CaCl— ). Apothecia small, convex, biatoroid, the thin thalline 

 margin being speedily excluded, red-testaceous, whitish within ; 

 spores fusiform, usually distinctly l-septate, 0,010-12 mm. long, 



