I 



LECAXOKA.] LECANO-LECIDEEI. 373 



Hah. Ou scliistose walls in a maritime district. — Distr. Ouly very 

 sparingly in N.E. Scotland; no doubt to be detected elsewhere. — B. M.: 

 Portletben, Kincardineshire. 



30. L. aurantiaca Xyl. Mem. Soc. Cherb. t. v. (1858) p. 112; 

 Lich. Scand. p. 142. — Thallus dctermiuate or subeffuse, thinnish, 

 granulato-verrucose, uneciual, yellowish or i)ale-lemon-coloured (K + 

 jjurplish) J hypothalliis dark-greyisli, limiting the thallus, often 

 obsolete. Apothecia moderate, sessile, plane or somewhat convex, 

 orange-coloured (K-f deep violet), usually biatoriiie with entire 

 proper margin ; the thalline margin thin, crenulate, speedily ex- 

 cluded : spores ellipsoid, polari-bilocular, U, 012-1 8 mm. long, 0,007 

 -10 mm. thick. — Cromb. Lich. Brit. p. 46. — Lecanora aurantiaca 

 var. salicinu Leight. Lich. Fl. p. 217, ed. 3, p. 200. Callojiisma 

 aurantiucinn a. salicinum Mudd, Man. p. 136. Leddea aurantiaca 

 Sm. Eng. Fl. v. p. 186 ; Tayl. in Mack. Fl. Hib. ii. p. 129 ; Gray, 

 Nat. Arr. i. p. 476. Lichen aurantiacas Lightf. Fl. Scot. ii. (1777) 

 p. 810 pro parte. Jiinodiaa mlicina Gray, Xat, Arr. i. p. 456. 

 Lichen saUcimts Eng. Bot. t. 1305. Lichen ji ivoruhesceas Huds. Fl. 

 Angl. p. 443 pro parte ; With. Arr. ed. 3, iv. p. 15 pro parte. — 

 I have retained Lightfoot's specific name, instead of the more deter- 

 minate one L. salicina Ach., owing to its being generally accepted, 

 though it includes also the subspecies that follows. — Brit. Exs.: 

 Mudd, n. 99 ; Leight. n. 212 : BohL u. 118. 



A very distinct species which cannot be confounded with any of its 

 allies. The thallus is somewhat variable in colour, l)eing occasionally 

 whitish or gieyisli (when the reaction is less distinct), and at times is 

 almost evanescent. The apothecia are numerous, thougli chiefly central, 

 and except in a very young .^tate are biatoroid. In otherwise sterile 

 plants the spermogones are especially frequent and papillseform, with 

 sperniatia 0,003-4 mm. long, scarcely 0,001 mm. tl ick. This state is 

 described by Achavius (Vet. Ak. Haudl. 1810, p. 148) as vai'. microtkelia 

 {cfr. Gray, Xat. Ait. i. p. 456). 



Hab. On the trunks of trees, chiefly pnplai-s, asb, and willows, also on 

 old pales, in maritime, lowland, and upland situations. — iJistr. General 

 and common in England, probably also in Wales, Scotland, and Ireland ; 

 rare in the Channel Islands. — B. M. : Island of Guernsey. Hadiscoe, 

 Sufiblk ; "SValthamstow, Essex; Hal-tead, Kent: Sussex; near St. 

 Helen's and Bembridge, Isle of Wight : Ilsham Valley, Torquay, and 

 near Plymouth, S.Devon; Cornwall: AVindsor Great Park, Berkshire; 

 Malvern and near Crowle, Worcestershire ; G( ipsall Park, Leicestershu'e ; 

 Oswestry' and Shrewsbury, Shropshire : Black Mount, Abergavenny, 

 Monmouthshire ; Garn, Denbighshire : Island of Anglesea ; Teesdale, 

 Durham ; Hexham and "Wansbeck, Xorthumb9rland ; Levens, West- 

 moreland. New Galloway, Kirkcudbrightshire : Largs, Ayrshire ; near 

 Edinburgh ; Connel Ferry, Argyleshire ; Finlarig, Killin, Perthshire ; 

 Abergeldie, Braemar, .\berdeenshire. Near Belfast, co. Antrim ; Clon- 

 mel, CO. Tipperary ; Ballynegard, co. Limerick. 



Subsp. 1. L. erythrella Xyl. Flora, 1873, p. 549.— Thallus 

 effuse, thin, or submoderate, areolato-diffract, or rugose and rimose, 

 yellow or orangc-ycllow (K-|- crimson). Apothecia biatorinc (rarely 



