500 LICHENACEI. [PERTUSARIA. 
Barcaldine, Argyleshire; Glen Lochay, S. of Loch Tay, Killin and 
Balthayock Woods, near Perth, Perthshire ; Countesswells Woods near 
Aberdeen, and Craig Cluny, Braemar, Aberdeenshire; near Fort William, 
Inverness-shire; Lairg, Sutherlandshire ; Applecross, Ross-shire. Blarney, 
co. Cork; Dunkerron, co. Kerry. 
Form rupestris DC. Fl. Fr. ii. (1805) p. 320; Nyl. Flora, 1881, 
p. 456.—Fertile verruce more or less aggregato-difform, verrucoso- 
areolate ; otherwise as in the type—Cromb. Lich. Brit. p. 59 (excl. 
syn.); Leight. Lich. Fl. p. 239, ed. 3, p. 230.—Pertusaria rupestris 
Mudd, Man. p. 272. Var. @. areolata Mudd (non Clem.), 1. c., is 
merely a darker state-—Brit. Ews.: Mudd, n. 259. 
Only a saxicolous condition of the type, from which it scarcely differs 
except in the thallus being usually more verrucose. 
Hab. On rocks in maritime and upland districts —Distr. Only 
sparingly in S. and N. England and the 8.W. Highlands of Scotland — 
B. M.: Hastings, Sussex; Ayton, Cleveland, Yorkshire; near White- 
haven, Cumberland; Island of Lismore, Argyleshire; Aberfoyle, 
Perthshire. 
Subsp. P. areolata Nyl. ex Hue, Rev. Bot. 1886, p. 74.— 
Thallus thickish, rimoso-areolate, rugose, shortly and more or less 
densely papillate, greyish-white (K - yellow). Apothecia as in 
the type.—Pertusaria’ areolata Nyl. Flora, 1881, p. 456; Cromb. 
Grevillea, xix. p. 59. Thelotrema pertuswm var. areolatum Clem. 
Ens. &c, Add. (1807) p. 300. 
Often confounded with the preceding form, but differs in the character 
of the thallus and in the reactions. As Nylander says, it may be a 
distinct species. In the British specimens only a few scattered apothecia, 
not well developed, are present. 
Hab. On rocks and walls, schistose and arenaceous, in mountainous 
districts.—Distr. Local among the Grampians and in the N.W. Highlands 
of Scotland.—B. M.: Craig Galliach and Craig Tulloch, Blair Athole, 
Perthshire ; Morrone, Braemar, Aberdeenshire; Hills of Applecross, 
Ross-shire. 
14. P. dealbata Nyl. ea Cromb. Lich. Brit. (1870) p. 59 (excel. 
syn. P. lactescens); Flora, 1880, p. 390.—Thallus subindetermi- 
nate, granuloso-unequal or papillose, rimose or diffract, thickish or 
somewhat thin, whitish or greyish-white (K+yellow, CaCl—. 
I ts pale blue): Apothecia in globulose, pulverulent verruce ; epithe- 
cium dark or sordid-glaucous, somewhat plane, suffused ; spores 2ne, 
0,080-15 mm. long, 0,050-82 mm. thick.—Cromb. Grevillea, xii. 
p. 57; Leight. Lich. Fl. p. 238, et ed. 3, p. 228 pro parte.—P, 
syncarpa et (3. dealbata Mudd, Man. p. 273. Lichen dealbatus Ach. 
Prodr. (1798) p. 29. Variolaria chlorothecia Tayl. in Mack. Fl. 
Hib. ii. p. 114. Isidium paradoxum Turn. & Borr. Lich. Br, 
p. 97; Sm. Eng. Fl. v. p. 281. Variolaria corallina Gray, Nat. 
Arr. i. p. 492; Tayl. in Mack. Fl. Hib. ii. p. 118.—Brit. Exs. : 
Leight. n. 320; Mudd, n. 261. 
