liECIDEA] LECIDEACE.E 29 



Differs from the type chiefly in the soredia and the colour of the 

 fructification. In the British specimens the apothecia are sparingly 

 present. The sterile plant is probably not uncommon in the 

 Highlands of Scotland, where the soredia are either yellowish or 

 subieruginose. 



Hah. On turfy ground in an upland hilly district. — B. M. Dart- 

 moor, Devon (the only locality). 



31. L. Wallrothii Floerke ex Spreng. Neue Entdeckung. ii. 

 p. 96 (1821). — Thallus effuse, thickish, appressed, granulose- 

 squamulose, whitish or glaucous, the granules more or less 

 scattered, or usually congested and confluent (K -f yellow, 

 K(CaCl)-f-red). Apothecia appressed, moderate or somewhat 

 large, plane or convex, pale- or dark-brown, subpruinose, the 

 margin pale, thin, inflexed ; paraphyses slender ; hypothecium 

 pale; spores ellipsoid, 0,018-21 mm. long, 0,009-11 mm. thick; 

 hymenial gelatine bluish then sordid wine-red with iodine. — 

 Cromb. in Grevillea xxii. p. 9. L. glebulosa Nyl. in Act. Soc. 

 Linn. Bord. ser. 3, i. p. 357 (1856) ; Cromb. Lich. Brit. p. 66 

 <1870). L. Salweii Borr. in Engl. Bot. Suppl. t. 2861 (1834); 

 Leight. Lich. El. p. 249 ; ed. 3, p. 241. Biafora glehulosa Fr. 

 Lich. Eur. p. 252 (1831) (excl. syn. Engl. Bot. t. 1955). 



Exsicc. Larb. Csesar. n. 32 ; Lich. Hb. n. 303 ; Cromb. n. 170. 



A very distinct species, easily recognized by the subsquamulose 

 thallus and slightly pruinose apothecia, which distinguish it from all 

 states of L. granulosa, to which it is somewhat similar. The 

 apothecia, at first plane and thinly margined, become at length convex, 

 often several confluent and immarginate. 



Hah. On the ground in crevices of rocks in maritime, rarely moim- 

 tainous districts. — Distr. Kather local, though usually plentiful where 

 it occurs in the Channel Islands, S.W. England and Wales. — B. M. 

 Beaufort Bay and the Warren, Noirmont, Jersey; Saint's Bay, 

 Guernsey ; Valley of Rocks, Lynton, Devon ; near Bodmin, St. 

 Michael's Mount, Hensborrow, and near Penzance, Cornwall ; near 

 Fishguard, Pembrokeshire ; banks of the Teify, Cardiganshire. 



32. L. demissa Th. Fries Lich. Scand. p. 420 (1874).— 

 Thallus subdeterminate, adnate-squamulose, greenish-brown or 

 lurid-greyish, the squamules smooth, verrucose-tumid or sub- 

 imbricate (K — , CaCl — ) ; hypothallus black. Apothecia small 

 or moderate in size, adnate, plane or convex, reddish-brown or 

 blackish, whitish within, the margin thin, soon obliterated ; 

 paraphyses stoutish, incrassate and brown at the apices ; 

 hypothecium colourless ; spores ellipsoid, 0,010-17 mm. long, 

 0,006-8 mm. thick ; hymenial gelatine deep blue with iodine. — 

 L. atrorufa Ach. Meth. p. 74 (1803) & Lich. Univ. p. 200; 

 Carroll in Journ. Bot. iv. p. 23 (1866) ; Cromb. Lich. Brit, 

 p. 67 ; Leight. Lich. Fl. p. 250 ; ed. 3, p. 242. Lichen demissus 

 Rutstr. Diss. PI. Crypt, p. 8 (1794). L. atrorufus Dicks. Crypt, 

 fasc. iv. p. 22 t. 12, f. 4 (1801); Engl. Bot. t. 1102. Lepldoma 



