LECAXORA.] LECAXO-LEC1DEEI. 413 



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

 variable plant, presenting the subspecies and varieties that follow. 



Hcib. 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. B. M. : New Forest, Hants ; Ulla- 

 combe, near Bovey Tracey, S. Devon ; near Cirencester, Gloucestershire ; 

 near Bakewell, Derbyshire ; Hollybush Hill, Malvern, Worcestershire ; 

 Wark-on-Tyne, Northumberland ; Calder Abbey and Alston, Cumber- 

 land ; Levens Park, Westmoreland. Near Glasgow, Lanarkshire ; 

 Pennycuick Glen, near . Edinburgh ; Barcaldine, Argyleshire ; Blair- 

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

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

 Limerick; Derryclare and Lough Inagh, co. Galway. 



Subsp. L. chlarona Xyl. Flora, 1883, p. 107. Thallus thin, 

 smoothish or subrugulose, whitish or greyish -white. Apothecia 

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

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

 15 mm. long, 0,005-9 mm. thick. Lecanora chlarona Cromb. Gre- 

 villea, xviii. p. 68. L. suf>fusca forma cMarona Leight. Lich. Fl. 

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

 p. 51. L. subfusca /. glabrata (non Ach.) Mudd, Man. p. 147. 

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

 Lich. Hb. nos. 256, 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 Nylander I. c. does not regard it as specifically 

 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, often crowded, and becoming darker in age. 



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

 maritime to upland situations. Distr. General and abundant 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, Torquay, and near 

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

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

 shire ; Gopsall Park, Leicestershire ; Aberdovey, Merionethshire ; Wrekin 

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

 Wastdale, Cumberland. Near Glasgow ; Appin, Argyleshire ; Finlarig, 

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

 Lochaber, Inverness- shire. Near Cork; Upper Lake, Killarney, 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 margin 

 of the apothecia. At times, however, it is a^ost confluent with the 

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

 The apothecia are either scattered or somewhat crowded. 



