LECAKORA.] LECAXO-LECIDEEI. 413 



give it much the general aspect of states of Z. angulosa. It is a rather 

 variable plant, presenting the subspecies and varieties that follow. 



Hah. On the trunks of old trees, from maritime to upland tracts. — 

 Distr. General but not common throughout Great Britain and Ireland ; 

 not seen from the Channel Islands. — J3. M. : New Forest, Hants ; Ulia- 

 combe, near Bovey Traoey, S. Devon ; n^ar Cirence>t>'r, Gloucestershire ; 

 near Bakewell, Derby.shire : Ilollybush Hill, Malvern, Worcestershire; 

 Wark-on-Tyue, Xorthumberland ; Calder Abbey and Alston, Cimiber- 

 land ; Leveiis Park, "Westmoreland. Near Glasgow, Lanarkshire ; 

 I'ennycuick Glen, near Edinburgh ; Barealdine, Argvleshire ; Blair- 

 drummond, near .Stirling ; Killin, Perthshire ; Cults, near Aberdeen. 

 Rostellan, co. Cork ; Old Dromore and Killarney, co. Kerry ; Tervoe, near 

 Limerick ; Deri'vclare and Lough Inagh, co. Gahvav. 



Subsp. L. chlarona Xyl. Flora, 1SS3, p. 107. — Thallus thin, 

 Bmoothish or subrugulose, whitish or greyish-white. Apothecia 

 small or subraodcrate, plane or slightly convex, pale or pale-brownish, 

 the thalline margin subcntire or finely crenulate ; spores 0,009- 

 15 mm. long, 0,0C>o-9 mm. thick. — Lccanora chlarona Cromb. Gre- 

 villea, xWii. p. 63. L. suhfusca forma chlarona Leight. Lich. Fl. 

 p. 203, ed. 3, p. 188. L. alhella form chlarona Crorab. Lich. Brit. 

 p. 51. L. subfusca -/. r/labrata (non Ach.) Mudd, Man. p. 1-17. — 

 Brit. Exs. : Leight. n. 115 ; Mudd, nos. 112, 113 pro parte ; Larb. 

 Lich. Hb. nos. '2o{), 257. 



Distinguished from the type by the thinner, smoother thallus, and the 

 non-rugose thalline margin of the apothecia. It so closely touches it, how- 

 ever, in other respects that Xylauder /. c. does not regard it as speciticallv 

 distinct. This view is further confirmed by the occurrence of intermediate 

 states with difficulty referable to either. It is always well fertile, the 

 apothecia being numerous, olten crowded, and becoming darker in age. 



Hab. On the smooth bark of trees, occasionally on old pales, from 

 maritime to upland situations. — Disfr. General and abimdant in 

 England: apparently rarer in N. Wales, Scotland, and Ireland. — B. M. : 

 Epping Forest, Essex; Shiere, Surrey; Wrotham, Kent; Glynde, 

 Sussex ; Lyndhurst, New Forest, Hants ; Ilsham, Torquav, and near 

 Bovey Tracey, S. Devon ; Withiel, Cornwall ; near Cirencester, Glou- 

 cestershire ; Ampthill, Bedfordshire : Over and Babraham, Cambridge- 

 shire ; Gopsall Park, Leicestershire : Aberdovey, Merionethshire ; Wrekiu 

 Hill, Shropshire ; near Ayton, Cleveland, Yorkshire : Teesdale, Durham ; 

 Wastdale, Cumberland. Near Glasgow ; Appin, Argvleshire ; Finlario', 

 Killin, Perthshire ; Countesswells Wood, near Aberdeen ; Locb Linnhe, 

 Lochaber, Inverness- shire. Near Cork; Upper Lake, Killarnev, co. 

 Kerry. 



Form pinastri Cromb. Grevillea, xviii. (1890) p. 68. — Thallus 

 subefFuse, thin, subleprose, greyish-white. Apothecia small, plane 

 or convex, brown, the thalline margin entire. — Lecanora subfusca 

 e. pinastri Schaer. Enum. (1850) p. 74 ; Mudd, Man. p. 146. 



Differs only in the less developed thallus and the entire thalline maroin 

 of the apothecia. At times, however, it is almost confluent with the 

 type, so that the differential characters given seem owing to the habitat. 

 The apothecia are either scattered or somewhat crowded. 



