BUELLIA] LECIDEACBiE 179 



small, smooth, plane or convex (K + yellow then red) ; hypo- 

 thallus black. Apothecia black, innate or appressed, becoming 

 superficial, plane or convex, the margin thin, entire, disappearing ; 

 hypothecium thick, dark-brown ; paraphyses somewhat lax, dark- 

 bluish-green or almost black at the apices ; spores dark-brown, 

 ellipsoid, 0,011-17 mm. long, 0,006-10 mm. thick; hymenial 

 gelatine deep-blue with iodine. — B. coracina Koerb. Syst. Lich. 

 Germ. p. 224 (1855) ; Mudd Man. p. 214. Verrucaria coracina 

 Hoffm. Deutschl. Fl. ii. p. 183 (1795) 1 Lichen atratus Sm. Eng. 

 Bot. t. 2335 (1811). Lecidea atrata Hook, in Sm. Eng. Fl. 

 p. 174 (1833) (non Ach. fide Th. Fr. Lich. Soand. p. 607). 

 L. coracina Nyl. in Act. Soc. Linn. Bord. ser. 3, i. p. 372 

 (1856) (non Ach. vel pro minore parte, fide Th. Fr. Lich. Scand. 

 p. 607) ; Cromb. Lich. Brit. p. 86 ; Leight. Lich. Fl. p. 307 ; 

 ed. 3, p. 321. 



Easily recognized by the very dark colour of the thallus and 

 apothecia. The specimens collected by Mudd and named by him 

 B. coracina are included under B. cethalea. They have a lighter- 

 coloured thallus and light-brown hypothecium. 



Hab. On rooks. — Distr. Somewhat rare in subalpine districts of 

 England, Scotland and Ireland. — B. M. Canlochan, Forfarshire ; 

 Morrone, Braemar, Aberdeenshire. 



Var. brunnea A. L. Sm. — Thallus brownish or black, com- 

 posed of small areolae contiguous or somewhat scattered on a 

 black, predominating, radiating hypothallus (K — , OaCl — ). 

 Apothecia black, convex, with a thin unequal margin, sometimes 

 several aggregate ; hypothecium thick, black ; paraphyses easily 

 separating from the hypothecium and brownish at the base, 

 subdiscrete, clavate and dark-greenish-blue or almost black at 

 the tips; spores rounded oblong, becoming dark-brown, 0,012- 

 15 mm. long, 0,008 mm. thick ; hymenial gelatine deep-blue with 

 iodine. 



Outwardly resembling Lecidea atrohrunnea Schser., a continental 

 species. It differs from the species in the lighter, more dispersed 

 thallus and in the absence of any thaUine reaction. 



Hab. On a granitic boulder. — B. M. Summit of Craig Calliaoh, 

 Perthshire. 



29. B. scabrosa Koerb. Syst. Lich. Germ. p. 227 (1855).— 

 Thallus determinate, appressed, thin, areolate or areolate-granu- 

 lar, citrine or yellow-greenish (K -f- yellow, OaCl — ) ; hypo- 

 thallus obsolete. Apothecia small, appressed, somewhat convex, 

 at length immarginate, black, slightly scabrid, hypothecium 

 black ; paraphyses slender, conglutinate, dull-greenish in the 

 mass, the epithecium black; spores ellipsoid, brown, 0,012-18 

 mm. long, 0,006-8 mm. thick ; hymenial gelatine tawny-wine-red 

 with iodine. — Lecidea scahrosa Ach. Meth. p. 48 (1803) ; S. F. 

 Gray Nat. Arr. i. p. 466 pro parte ; Hook, in Sm. Engl. Fl. v. 



N 2 



