PERTUSARIA. | LECANO-LECIDEET, 501 
The thallus spreads extensively and is occasionally of considerable 
thickness. It is usually more or less covered with short, simple, con- 
colorous papille which are at length fractured into rugose areole. 
When fertile the verrucae are generally aggregate, becoming irregularly 
lacerate. It is, however, more frequently sterile, and is then at times 
ie host of the parasitic Spiloma spherale Ach., which occurs also on the 
orm. 
Hab. On rocks, boulders, and walls in maritime and mountainous 
regions.— Distr. Apparently general and commor in Great Britain and 
Ireland ; rare in the Channel Islands.—B. M.: Island of Sark. Dartmoor 
Tors, Devonshire ; St. Austell, Cornwall; Malvern Hills, Worcestershire ; 
Barmouth, Aberdovey, and Cwm Bychan, Merionethshire; Island of 
Anglesea; Oswestry and Caer Caradoc, Shropshire; Kildale Moor, 
Cleveland, Yorkshire; Teesdale, Durham. Ben Cruachan, Argyleshire ; 
The Trossachs, Crianlarich, Ben Lawers, and Craig Calliach, Perthshire ; 
Sidlaw Hills and Clova, Forfarshire ; Glen Callater, Braemar, Aberdeen- 
shire. Dunkerron and Finnehy River, co. Kerry; Dawros River, 
Connemara, co. Galway. 
Form corallina Cromb. Grevillea, xii. (1883) p. 59.—Thallus 
thick, densely papillose; the papille elongate, thin, simple and 
branched.—P. syncarpa y. corallinum Mudd, Man. p. 273. Jsidium 
corallinum Gray, Nat. Arr. i. p. 412; Turn. & Borr. Lich. Br. 
p- 100; Hook. FI. Scot. ii. p. 66; Sm. Eng. Fl. v. p. 231. Lnchen 
corallinus Linn, Mant. (1767) p. 1381; Huds. Fl. Angl. ed. 2, p. 526; 
Lightf. FL. Scot. ii. p. 808; With. Arr. ed. 3, iv. p. 16 pro parte ; 
Eng. Bot. t. 1541. 
Differs from the type in the character of the isidioid papille. It is, 
however, connected with it by intermediate states, so that perhaps it is 
to be regarded only as a luxuriant condition. It is never seen fertile. 
Hab. On rocks in maritime and upland situations.—Distr. Seen in 
a typical state only from a few localities in Great Britain and Ireland. 
—B. M.: near Pont-ned-vechan, Brecknockshire; Barmouth, Merio- 
nethshire; Island of Anglesea; Ayton Moor, Cleveland, Yorkshire ; 
Eglestone, Durham; Alston, Cumberland. Ben-y-gloe, Perthshire ; 
Baldovan Woods, Forfarshire. The Dargle River, co. Wicklow. 
15. P. ceuthocarpa Turn. & Borr. Lich. Br. (1839) p. 200; 
Nyl. Mém. Soc. Cherb. t. v. p. 116.—Thallus determinate, thickish, 
areolato-diffract, cream-coloured; the areole convex, undulato- 
rugose (K+yellow, then deep orange-red).—Apothecia few, in sub- 
globose, smooth, conglomerate verruce; the ostioles minute, 
punctiform, blackish; spores 2ne, 0,150-170 mm. long, 0,057- 
60 mm. thick—Sm. Eng. Fl. v. p. 160; Mudd, Man. p. 271; 
Cromb. Lich. Brit. p. 58; Leight. Angio. Lich. p. 28, t. 9. f. 4; 
Lich. Fl. p. 237, ed. 3, p. 228.—Porina ceuthocarpa Tayl. in 
Mack. FI. Hib. ii. p. 102. Lichen ceuthocarpus Sm. Eng. Bot. xxxiii. 
(1812) t. 2372.— Brit. Eus.; Leight. n, 284. 
Apparently an endemic species well distinguished by the characters 
given. The areole are at times plane, especially towards the circum- 
ference, where the plant is limited by a dark-olive hypothalline margin, 
