BDELLIA] LECIDEACE.>E 183 



Neu. Entdeck. ii. p. 95 (1821); Schfer. Enum p. Ill; Cromb. 

 Lich. Brit. p. 86 ; Leight. Lich. El. p. 306 ; ed. 3, p. 318. 



Hab. On alpine schistose rooks. — Distr. Rare on the Grampians, 

 Scotland, and S.W. Ireland. — B. M. Looh-na-gat, Ben Lawers, Perth- 

 shire ; Killarney, Kerry. 



Var. atrobadia A. L. Sm. — Differs from the species in the 

 more scattered thallus and in the more marked radiating hypo- 

 thallus. Apothecia larger, convex, the epithecium dark-violet- 

 brown (K-f purphsh) ; spores oblong, brown, 0,021-30 mm. long, 

 0,010-14 mm. thick. — Lecidea atrobadia Nyl. in Elora Iv. p. 361 

 (1872); Cromb. in Grevillea i. p. 62; Leight. Lich. El. ed. 3, 

 p. 318. 



Hah. On a quartzose boulder in an alpine situation. — B. M. 

 Summits of Ben-y-gloe, Blair Athole, Perthshire (the only locality). 



36. B. atroalba Th. Fr. Lich. Arct. p. 230 (1860), pro 

 parte. — Thallus greenish or brownish, tartareous, determiaate, 

 cracked-areolate, the areolse plane or convex. Apothecia black 

 or brownish-black, appressed plane or slightly convex, the margin 

 thin or disappearing, hypothecum brownish-black ; paraphyses 

 subdiscrete, rather stout, slightly clavate and blackish at the 

 tips ; spores oblong or oblong-elliptical, slightly constricted at 

 the septum, brownish, large, with a hyaline epispore, 0,025- 

 36 mm. long, 0,012—17 mm. thick. — Lichen atroalbus L. Sp. PI. 

 p. 1141 (1753)?; Lightf. El. Scot. ii. p. 804 (1777)? (non With. 

 Arr. ed. 3, iv. p. 5 (1796), which is Lecidea aglxa pro parte, fide 

 Cromb. in Grevillea xii. p. 57 (1883)) ; Ach. Prodr. Lich. Suec. 

 p. 63 (1798) ; Engl. Bot. t. 2336 1 Lecidea atroalba Ach. Meth. 

 p. 45 (1803) ; Hook. El. Scot. ii. p. 36 & in Sm. Engl. El. v. 

 p. 174 pro parte; Tayl. in Mackay El. Hib. ii. p. 116 pro parte; 

 Cromb. Lich. Brit. p. 86 ; Leight. Lich. El. p. 305 ; ed. 3, p. 317. 



Exsiec. Leight. n. 186. 



Differs from the preceding in the thinner, lighter coloured thallus 

 and in the colour of the epithecium, which does not show any reaction 

 with potash. 



Hab. On maritime and alpine rocks. — Distr. Bare in S. England, 

 Wales, E. Scotland and Ireland. — B. M. Torquay, Devon; Llandyssil, 

 Cardiganshire ; Cove and Portlethen, Kincardineshire ; Cape Clear 

 Island and near Cork. 



37. B. Parmeliarum Oliv. Exp. Syst. Lich. ii. p. 393 (1903). 



Thallus none. Apothecia minute, subinnate-sessile, convex, 



immarginate, black, naked or greenish-pruinose ; hypothecium 

 brown; paraphyses concrete; spores ovoid-oblong, brown, 0,017- 

 21 mm. long, 0,007-8 mm. thick ; hymenial gelatine not tinged 

 with iodine. — Lecidea Parmeliarum Sommerf. Suppl. El. Lapp, 

 p. 176 (1626) ; Cromb. Lich. Brit. p. 92 ; Leight. Lich. El. 

 p. 357 ; ed. 3, p. 386. Ahrothalhs Smithii Tul, in Ann. Sc. Nat, 



