USfBILICARTA.] GYROPHOEKI. 323 



1. U. pustulata HofFm. Deutsch. Fl. ii. (1795) p. 111. Thallus 

 large, monophyllous, inciso-lobed at the circumference, papulose, 

 pale-greyish or greyish-brown, subpruinose, sprinkled with large 

 fuliginoso-floccose glomeruli ; beneath deeply lacunoso-foveolate, 

 naked, brownish or greyish-pruinose, very minutely rimuloso-areo- 

 late (K~, CaCl^ redc j isli ). Apothecia moderate, superficial, scattered, 

 somewhat plane ; spores large, solitary, 0,028-70 mm. long, 0,018 

 34 mm. thick. Sm. Eng. El. v. p. 219 ; Mudd, Man. p. 115, t. ii, 

 f. 35 ; Leight. Ann. Mag. Nat. Hist. ser. 2, xviii. p. 294 ; Cromb. 

 Journ. Linn. Soc. Bot. xvii. p. 576. Gfyrophora pustulata Gray, 

 Nat. Arr. i. p. 478 ; Hook. Fl. Scot. ii. p. 42 ; Turn. & Borr. Lich. 

 Br. p. 232 ; Tayl. in Mack. Fl. Hib. ii. p. 155 ; Cromb. Lich. Brit. 

 p. 40 ; Leight. Lich. Fl. p. 154, ed. 3, p. 143. Lichen pustulatus 

 Linn. Sp. PL (1753) p. 1150; Huds. Fl. Angl. p. 454 ; Lightf. Fl. 

 Scot. ii. p. 858 ; With. AIT. ed. 3, iv. p. 64 ; Eug. Bot. t. 1285. 

 Lichenoides pustulosum cinereum et veluti ambustum Dill. Muse. 226, 

 t. 30. f. 131. Brit. Exs. : Leight. n. 166; Larb. Caesar, n. 25; 

 Cromb. n. 52 ; Bohl. n. 125. 



The peculiar pustular and isidio-glomerulose upper, and the deeply 

 pitted under surface of the thallus at once distinguish this from the other 

 British species of the tribe. The thallus, which is greenish when moist, 

 is normally orbicular, becoming at length irregular in shape, and often 

 attains a very large size. The apothecia, which are rare in Britain, are 

 scattered among the gloineruli chiefly towards the circumference, and 

 are at first concave, then plane or convex, with the margin at length 

 excluded. 



Hob. On rocks and boulders, rarely on old walls, in mountainous dis- 

 tricts. Distr. Somewhat local, though plentiful where it occurs in the 

 Channel Islands, S. and W. England, S. Scotland, the W. Highlands 

 and Shetland, Scotland, and in S.W. Ireland. B. M. : La Move, Island 

 of Jersey ; Island of Guernsey. Blackstone Rock, near Bovey Tracey, 

 Hay Tor and Hunter Tor, Dartmoor, Devonshire ; Helminton, Cornwall ; 

 Malvern Hills, Worcestershire ; Charnwood Forest, Leicestershire ; Caer 

 Caradoc, Shropshire ; Cwm Bychan, Merionethshire ; Capel Curig and 

 Nant Gwynant, Carnarvonshire ; Nepha, Westmoreland ; Wastdale, 

 Cumberland. New Galloway, Kirkcudbrightshire ; Loch Sligachan and 

 Loch Corruisk, Isle of Skye ; Ben Nevis, Inverness-shire ; Sandy Loch, 

 near Lerwick, Shetland. Mizen Head and Glengariff, co. Cork ; near 

 Dunkerron, co. Kerry. 



Subgen. 2. AGYROPHORA Nyl. Flora, 1878, p. 247. Thallus 

 epapulose above, efoveolate beneath, internally with the chondro- 

 hyphse continuous in the cortical layer of the lower surface. Apo- 

 thecia with the spores 8nao, simple, colourless. 



2. U. atropruinosa Schser. Ser. Mus. Helv. vi. (1829) p. 109, 

 t. 12-14. Thallus moderate, monophyllous or subpolyphyllous, 

 rigid, thinly areolato-rimulose or rugoso-areolate, brownish-black, 

 greyish-pruinose in the centre ; beneath smoothish or very finely 

 granulato-areolate, black or partly paler, often pruinose (medulla 

 K , CaCl ). Apothecia somewhat prominent, nearly moderate, 



Y2 



