70 LECANO-LECIDEEl [lECIDEA 



bluish-grey-pruinose, the margin prominent, thinnish, naked, 

 entire ; hypothecium thick, brownish-black ; paraphyse.s slender, 

 coherent, dark at the apices ; epithecium granulose ; spores 

 oblong or ellipsoid, 0,020-28 mm. long, 0,007-10 mm. thick; 

 hymenial gelatine deep-blue, asci wine-reddish, with iodine. — 

 S. F. Gray Nat. Arr. I. p. 467 pro parte ; Hook. Fl. Scot. ii. 

 p. 38 ; Mudd Man. p. 211 ; Leight. Lich. Fl. p. 295 pro parte; 

 ed. 3, p. 303. L. contigva var. alboccerulescens Nyl. Lich. Scand. 

 p. 224 ; Cromb. Lich. Brit. p. 80. Lichen alboccerulescens Wulfen 

 in Jacq. Coll. ii. p. 184, t. 15, f. 1 (1788). 



The apothecia are numerous and at times more or less confluent, 

 with the margin subflexuose. In old plants the bloom almost 

 disappears. 



Hah. On rocks and stones of walls in maritime and upland districts. 

 — Distr. Seen from only a few localities in Great Britain and in N.W. 

 Ireland. — B. M. Withiel, Cornwall : Dartmouth, Devon ; Leith Hill, 

 Surrey ; Stormy Down, Glamorganshire ; Llandyssil, Cardiganshire ; 

 Langbaurghrigg, Cleveland, Yorkshire ; Stavely Head, "Westmore- 

 land ; Achosragan Hill, Appin, Argyll ; near Achmore, Killin, Perth- 

 shire ; Slegachan, Isle of Sk^^e ; near Tully, Galway. 



Var. ^ alpina Sch^r. Spicil. ii. (1828), p. 143.— Thallus 

 thickish. Apothecia somewhat large, prominent, plane or 

 convex, the margin more or less flexuose. — Mudd Man. p. 211 ; 

 Leight. Lich. Fl. ed. 3, p. 303. 



Characterized by the thicker thallus and the margin of the larger 

 apothecia, which are occasionally 2-3 aggregate, when the margin is 

 less distinct. 



Hah. On damp rocks, granitic and schistose, in maritime and 

 mountainous districts. — Distr. Seen from only a few localities in 

 Great Britain, Ireland and the Channel Islands. — B. M. Island of 

 Sark ; St. Mervyn, Cornwall ; Aberedw, Radnorshire ; Cader Idris, 

 Merioneth ; Langbaurghrigg, Cleveland, Yorkshire ; Achosragan Hill, 

 Appin, Argyll ; Glen Dee, Braemar, Aberdeenshire ; Moher, Clare. 



117. L. crustulata Koerb. Syst. Lich. p. 249 (1855).— Thallus 

 effuse, very thin, leprose-tartareous, subrimulose or slightly verru- 

 culose, greyish-white or brownish (K — , CaCl — ); hypothallus 

 black, scarcely visible. Apothecia small, sessile, plane, black, 

 margined, the margin entire ; paraphyses concrete, brownish or 

 blackish at the apices ; hypothecium thick, blackish ; spores 

 oblong, 0,014-18 mm. long, 0,006-8 mm thick; hymenial 

 gelatine bluish then sordid, asci wine-red, with iodine. — Mudd 

 Man. p. 209 (excl. var. /3) ; Leight. Lich. Fl. p. 257 ; ed. 3, p. 249. 

 L. parasema var. crustulata Ach. Lich. Univ. (1810) p. 176. 

 L. contigua var. crustulata Cromb. Lich. Brit. p. 80. 



Exsicc. Mudd n. 177 ; Leight. n. 333. 



Approaches some forms of L. contigua, but is well differentiated 

 by the thin leprose thallus and the smaller apothecia and spores. 



