PERTTTSAKIA.] LECAXO-LEClDEi;i. 495 



Hnh. On trnnlis and branches of trees, very rarely on schistose rocks, in 

 maritima and upland districts. — Disfr. Not uncommon in JMigland and 

 Wales; rarer in Ireland ; very rare in the S.W. Highlands of Scotland. 

 — B. M. : Shiere, Surrey; St. Leonard's Forest and Glynde, Sussex: 

 Isle of Wight; Lyndhurst, New For(>st, Hants; East Lynn, Devonshire ; 

 Bocconoc, Cornwall ; Cirencester, Gloucestershire ; Twycross, Leicester- 

 shire ; Barmouth and Cwm Bychan, INIerionethshire ; Conway Falls, 

 Carnarvonshire ; lirantsdale, Yorkshire ; Teesdale, Durham ; Asby, Cum- 

 berland. Barcaldine, Argyleshire. Kavenscourt, co. Wicklow ; Oastle- 

 bernard, co. Cork ; Cromaglown and Turk Mt., Killarney, co. Kerry ; 

 Kylemore Lake, Counemara, co. Galway. 



Form 1. laevigata Cromb. — Thallus thin, continuous or very 

 slightly riinose, scarcelj' subrugulose, the thalline verrucoe depressed, 

 more or less scattered. — Yariolaria inuUijnincta var. /3. Icpviqata 

 Turn. & Borr. Lich. Br. (183!)) p. 73; Sm. Eng. Fl. v. p. 170. 

 V. constdlata Tayl. iu Mack. Fl. Hib. ii. p. 113 pro parte. 



Apparently only a less developed condition resulting from the nature 

 of the substratum. 



Hab. On smooth bark of young trees in wooded upland tracts. — Distr. 

 Oolv a few localities in S. England and S.W. Ireland. — B. M. : St. 

 Leonard's Forest, Sussex ; New Forest, Hants ; Falls of Beekey, S. Devon. 

 Askew Wood, co. Kerry. 



Form 2. fastigiata Cromb. — Thalline verrucse submoderate or 

 somewhat large, hemispherical, crowded, substipitate, fastigiata and 

 sorediate at the apices : otherwise as in the type. — Pertusaria fast'i- 

 (/ata Leigbt. Ann. Mag. x^at. Hist. 1570, vi. p. 474 ; Lich. Fl. p. 24.5, 

 ed. 3, p. 236. Isidiiim ocidatum var. /j. fastigintum Turn. & Borr. 

 Lich. Br. (1839) p. 10'6, fide Leight.; Sm.Eng. Fl. v. p. 232. Vaiio- 

 laria polythecia Tayl. in Mack. Fl. Hib. ii. p. 113. 



A well-marked form, if not a distinct variety, differing in the character 

 of the verrucse. Dr. Taylor /. c. says that it is " conspicuous by the 

 crowded and stalked apothecia placed in contact, like certain basaltic 

 columns." In the few specimens seen the spores are very seldom well 

 developed. 



Hah. On naked rocks and incrusting mosses in mountainous regions. 

 — Distr. Found only in S. and W. Ireland. (Bantr}^, co. C.u-k; Conne- 

 mara, co. Galwa^-.) — B. M. : Dunkerron, co. Kerry. 



7. P. globulifera Xyl. Mem. Soc. Cherb. v. (1857) p. 116.— 

 Thallus suborbicular, caitilagineo-membranaceous, verrucoso-rugose, 

 greyish or glaucous, white-sorediate, smoothish. and zonate at the 

 circumference (K — , CaCl — ). Apothecia inclosed in large thalline 

 verrucse, which are at hrst globular, closed, slightly depressed at the 

 apices, corticate, at length lacero-dehiscent, pseudo-scutelliform, 

 white-sorediate ; spores (rarely 2nae) 0,207-276 mm. long, 0,050- 

 80 mm. thick. — Mudd, Man. p. 273 (excl. vars.) ; Cromb. Lich. Brit, 

 p. 59 (excl. vars.) ; Leight. Lich. Fl. p. 243, ed. 3, p. 233. — Variolana 

 glohidifera Turn. Trans. Linn. Soc. is. (1808) p. 139 ; Turn. & Borr. 



