566 CYCLOCARPINEE [PERTUSARIA 
Church Stretton and Llanford, Shropshire; Enville, Staffordshire ; 
Great Glenham, Suffolk; Millersdale, Derbyshire ; Kildale and near 
Ayton, Cleveland, Yorkshire ; Teesdale, Durham ; Windermere, West- 
moreland; Calder Abbey, Northumberland; Gilgarron and near 
Whitehaven, Cumberland; New Galloway, Kirkcudbrightshire ; Roslin 
and Colinton Woods, Midlothian; near Glasgow; Barcaldine and 
I. of Lismore, Argyll; Glen Lochay, Killin, Aberfoyle and Balthayock 
Woods, Perthshire; Countesswells Woods, near Aberdeen and Craig 
Cluny, Braemar, Aberdeenshire; near Fort William, Invernessshire ; 
Applecross, Rossshire; Lairg, Sutherlandshire ; Dunkerron, Kerry. 
15. P. areolata Nyl. in Flora lxiv. p. 456 (1881).—Thallus 
determinate, thickish, more or less densely papillate, cracked- 
areolate, light- or darkish-grey (K + yellow). Apothecia with a 
minute blackish disc ; epithecium K + violet; spores 2 in the 
ascus (or sometimes more), 130-205 » long, 45-80 p» thick.— 
Cromb. in Grevillea xix. p. 59 (1891). P. communis subsp. 
areolata Nyl. ex Hue Add. Nov. Lich. Eur. p. 118 (1886) ; 
Cromb. Monogr. i. p. 500. Thelotrema pertusum var. areolatum 
Clem. Ensayo, p. 300 (1807). 
Though classified as a subspecies of P. pertusa by Nylander and 
others, there is a great difference in thalline characters, and in the 
much brighter reaction with potash. The British specimens are 
without apothecia; it has therefore been impossible to verify the 
spore characters. 
Hab. On siliceous rocks and walls in maritime districts.—Dis¢r. 
Among the Grampians, Scotland, and W. Ireland.—B. M. Craig 
Calliach and Craig Tulloch, Blair Athole, Perthshire; Morrone, 
Braemar, Aberdeenshire ; Hills of Applecross, Rossshire. 
16. P. ceuthocarpa Turn. ex Sm. Engl. Bot. t. 2372 (1821) 
note. — Thallus determinate, thickish, cracked-areolate and 
warted, the areole convex, unequal, cream-coloured (K + yellow, 
then deep-red). Apothecia in subglobose or irregularly con- 
glomerate smooth verruce, deeply immersed, the discs puncti- 
form, blackish ; spores 2 in the ascus, thick-walled, 150-175 uv 
long, 40-60 » thick.—Hook. in Sm. Engl. Fl. v. p. 160; Turn. & 
Borr. Lich. Brit. p. 200; Leight. Angioc. Lich. p. 28, t. 9, fig. 4 
& Lich. Fl. p. 237 ; ed. 3, p. 228; Mudd Man. p. 271; Cromb. 
Lich. Brit. p. 58 & Monogr. i. p. 501. Lichen ceuthocarpus Sm. 
Engl. Bot. t. 2372 (1812). Porina ceuthocarpa Tay]. in Mackay 
Fl. Hib. ii. p. 102 (1836). 
Ezsice. Leight. n, 284. 
There are only a few British Pertusarie with the above strongly- 
marked potash reaction, and among them P. cewthocarpa is dis- 
tinguished by the thickish unequal thallus, by the large tumid fertile 
verruce, and by the saxicolous habitat. On the continent if is 
classified along with P. coccodes, which is corticolous, while Smith’s 
plant is saxicolous. Fries, however, records P. cewthocarpa as saxi- 
colous in Scandinavia and in Germany (Lich. Eur. p. 423). 
