257 
B. conropsoipEuM (Hepp.) Eck. 
Thallus consisting of scattered white irregular flat scales, which 
are diffused over a black hypothallus; apothecia arising from the 
hypothallus, sparingly scattered, black, flat and somewhat promi- 
nent, with a raised rugose margin; disk roughened and finely pa- 
pillose; spores ellipsoid, 4-locular, sat mic. On rocks. 
B. geographica (F1.) Tuck. 
B. pertusaricola Willey. 
B. parmeliarium Som. 
B. saxatilis (Sch.) Koerb. 
B. scabrosa (Ach.) Koerb. 
B, opscurata (Ach. Koerb.) Eck. 
Thallus pale to fuscesent or rufofuscescent, thin, finally areo- 
late, continuous, areoles plane, simple; apothecia black, naked, 
plane, sessile, innate or strongly adnate with a thicker obtuse pale 
margin; spores 8 in the thekes, ellipsoid, murilocular, ss mic. 
On rocks. pies 
B, r1vuraris (Flot.) Eck. ‘ 
Thallus pale olive brown, areolate, diffiform, areoles flat upon a 
black hypothallus; apothecia large, flat, sunken in the areoles, black 
with a prominent raised waving margin; spores broadly ellipsoid, 
bilocular, fuscous, os mic. On rocks. 
B. Copetanp1 (Koerb.) Eck. 
Thallus composed of large irregular coarse whitish granules, 
becoming areolate, dispersed, seated upon a black hypothallus; 
apothecia large, black and prominent, more or less finely turbu- 
culate, but becoming flattish and concave, with a persistent mar- 
gin; spores ellipsoid, bilocular, fuscescent, aa mic. On rocks. 
B. badioatra (F 1.) Schr. 
B, concreta (Koerb.) Eck. 
Thallus minutely granulose, closely adnate, pale ashy to 
whitish, bordered by a flexvous hypothalline line; apothecia ses- 
sile, minute and innate, immarginate with a thickened brown 
border; spores ellipsoid, murilocular, 4a mic. On rocks. 
B, cALcaREA (Weis) Eck. 
Thallus determinate, white, roundish, of mealy or tartareous 
granules, areolate, rimulose towards the centre, configurate at the 
border ; apothecia large, black, innate, plane, bluish, pruinose, con- 
vex, surrounded by a white thalline margin, proper margin dark, 
persistent; spores ellipsoid to oblong, 4-locular, = mic. On 
rocks. 
