LECANORA.] LECANO-LECIDEEI. 445 



violet-red with iodine. Cromb. Grevillea, xviii. p. 69. Lecanora 

 albariella Nyl. Bot. Zeit. 1861, p. 338 (nota), cfr. Act. Soc. Linn. 

 Bord.t.xxv.(1864)p. 63; Jones, Nat. Hist. Soc. Dublin, 1864, p. 119; 

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



Apparently a good subspecies, characterized by the differences given in 

 the thallus and apothecia. According to Nylander in lift., L. (Aspicilia) 

 lactea Mass. Symm. Lich. 1855, p. 26, is scarcely different. The two 

 British specimens seen are fairly typical and well fertile. 



Hob. 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. Glenarni, co. Antrim. 



Subsp. 2. proteiformis Nyl. Flora, 1881, p. 538. Thallus thickish 

 or somewhat thin, granuloso-verrucose, areolato- diffract or subpul- 

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

 thecia biatorine, 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, 0,003-4 

 mm. thick ; hymenial gelatine bluish with iodine. Biatora protei- 

 formis Mass. Sched. crit. (1855) p. 92. 



Very variable in external appearance, but distinguished by the smaller 

 spores, which in our specimens are 0,010-11 mm. long, 0,0035 mm. 

 thick. These were erroneously referred by me in Journ. Bot. 1874, p. 148, 

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



Hob. On calcareous rocks and walls in upland tracts. Distr. Only 

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

 near Painswick and Cirencester, Gloucestershire. 



135. L. phEeoleucodes Nyl. 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, 0,005 mm. thick ; hymenial 

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

 p. 112. 



Probably distinct from L. erysibe, to which in the apothecia it Is sub- 

 similar, though differing in the longer spores. The thalline margin of 

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

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

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



Hob. On a calcareous rock in a maritime district. Distr. Local and 

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

 Argyleshire. 



136. L. Hutchinsia Nyl. 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 1-septate, 0,010-12 mm. long, 



