lecidea] lecideace^ 55 



Differs from L. latypea in the much thinner, more furfuraceous 

 thallus, and in the usually almost colourless hypothecium. Acharius' 

 species L. enteroleuca (Lich. Univ. p. 177 (1810)) grows on trees and 

 is included under L. parasema var. elceochroma. 



Hah. On rocks and stone walls. — Distr. Frequent in all parts of 

 the British Isles. — B. M. St. Lawrence, Isle of Wight ; Ardingly 

 Eocks, St. Leonard's Forest, Sussex ; Ulting, Essex ; near Bath, 

 Somerset ; Cirencester, Gloucestershire ; Llandyssil, Cardingan shire ; 

 near Oswestry and Tong Priory, Shropshire ; Barmouth and Dolgelly, 

 Merioneth ; Capel Curig, Carnarvonshire ; Shawswell, Gloucestershire ; 

 Ayton, Cleveland and near Battersby, Yorkshire ; Lamplugh, 

 Cockermouth, Cumberland ; Glen Tilt, Craig Calliach and Craig 

 TuUoch, Blair Athole, Perthshire ; Barcaldine, Argyll ; near Kylemore, 

 Connemara and Lough Cooter, Galway. 



Var. /? acervata Mudd Man. p. 202 (1861).— Thallus effuse, 

 greyish-white, granular, the granules becoming more or less 

 pulverulent and greenish-yellow. Apothecia small, aggregated 

 into clusters of 4 to 20, at first plane and marginate, becoming 

 convex and immarginate ; paraphyses lax, black at the tips. 



Exsicc. Mudd n. 173. 



Hah. On rocks and stones in mountainous districts. — B. M. 

 Frequent at High cliff, Cleveland, Yorkshire (the only locality). 



84. L. inserena Nyl. in Flora, lii. p. 84 (1869).— Thallus 

 thickish, cinereous, grey, rimose-areolate or areolate-granulose, 

 the areolae plane, often occurring as scattered granules on a 

 black hypothallus. Apothecia black, plane or slightly convex ; 

 hypothecium colourless, with an opaque white stratum in the 

 lower portion ; paraphyses indistinct, blackish-olive at the tips ; 

 spores ellipsoid, oblong, 0,014-17 mm. long, 0,006-8 mm. thick; 

 hymenial gelatine blue, the asci becoming violet-coloured, with 

 iodine. — Cromb. in Journ. Bot. vii. p. 107 ; Lich. Brit. p. 85 ; 

 Leight. Lich. Fl. p. 278 ; ed. 3, p. 280. 



Resembling somewhat tumid forms of L. tenehrosa, but well 

 distinguished by the colourless hypothecium. 



Hah. On granite rocks. — Distr. Very rare on the Grampians, 

 Scotland. — B. M. Ben Lawers, Perthshire ; Craig Guie and Morrone, 

 Braemar, Aberdeenshire. 



85. L. viridans Koerb. Syst. Lich. Germ. p. 242 (1855).— 

 Thallus effuse, thin, minutely granulose, yellowish-green or 

 sordid-greenish (K£ -}- yellowish, CaCl — K(CaCl) + orange-red); 

 hypothallus evanescent. Apothecia small, innate-sessile, at first 

 plane, and thickly margined, at length convex and submarginate, 

 black, sometimes greenish-suffused ; hypothecium yellowish ; 

 paraphyses subdiscrete, dark-greenish above ; spores ellipsoid- 

 oblong, small, 0,009-12 mm. long, 0,006-8 mm. thick; hymenial 

 gelatine bluish with iodine. — Leight. Lich. Fl. ed, 3, p. 271. 

 L. sahuletorum var. viridans Flot. in Flora xi. p. 697 (1828). 



Exsicc. Leight. n. 331 ; Larb. Lich. Hb. n. 307. 



