112 LECANO-LECIDEEI [bIATORINA 



Intimately related to the preceding, for states of which it might 

 readily be taken ; it differs, however, chiefly in the more constantly 

 and densely pruinose thallus, the more persistently margined apothecia, 

 and the paler hypothecium. The apothecia, not numerous in our 

 specimens, become in age angulose with the margin flexuose. 



Hah. Incrusting mosses on calcareous rocks and on soil in their 

 crevices in hilly and mountainous tracts. — Distr. Only a very few 

 localities in England and Wales and on the S. Grampians, Scotland. 

 — B. M. Torquay, Devon ; Cleeve Hill, Yatton, Somersetshire ; Ingle- 

 borough, Yorkshire; Great Orme's Head, Carnarvonshire; Isle of Man ; 

 summit of Craig Calliach, Head of Loch-na-Gat, and near the summit 

 of Ben Lawers, Perthshire. 



3. B. tumidula A. L. Sm. — Thallus subdeterminate, thickish, 

 verrucose- or areolate-squamulose, the areolae sublobate-plicate, 

 turgid, wrinkled or cracked on the surface, white or glaucous- 

 white (K—, CaCl — ). Apothecia moderate, sessile on the mar- 

 gins of the areolae, at first plane and thinly margined, then 

 convex and immarginate, often confluent, black, naked, black 

 within ; hypothecium thick, reddish-black ; spores oblong, in- 

 distinctly 1-septate 0,012 mm. long, 0,006 mm. thick ; hymenial 

 gelatine bluish with iodine. — Lichen tumidulus Sm. in Trans. 

 Linn. Soc. i. p. 82, t. 4, f. 3 (1791). L. mamillaris Gouan Herb. 

 Montp. p. 88 (1796). Lecidea mamillaris Duf. in Fr. Lich. Eur. 

 p. 285 (1831) ; Carroll in Journ. Bot. iii. p. 290 (1865) ; Cromb. 

 Lich. Brit. p. 77 ; Leight. Lich. Fl. p. 254 ; ed. 3, p. 245. 

 Thalloidima mamillare Massal. Ric. Lich. p. 96, fig. 198 (1852) ; 

 Mudd Man. p. 170. 



Well characterized by the superficially wrinkled or subgyrose 

 thallus. The squamules, usually crowded, are at times somewhat 

 scattered ; the spores are obscurely bilocular. 



Hab. On the soil in crevices of sandy and calcareous rocks in 

 maritime and upland districts. — Distr. Very local and scarce in S.W. 

 and (Jide Leighton) in central England (Dovedale, Derbyshire). — 

 B. M. Babbicombe and Torquay, Devon; Cleeve Hill, Yatton, 

 Somerset. 



4. B. cumulata Th. Fr. Lich. Arct. p. 187 (I860).— Thallus 

 ■effuse, thickish, unequal, warted or squamulose, the squamules 

 small, crenate-lobed or radiating at the circumference, greyish 

 (K+yellow, CaCl — ); hypothallus black. Apothecia minute, 

 plane, crowded, black or reddish-black, with a thin paler margin, 

 at length evanescent; hypothecium pale-brownish, narrow, red- 

 dish-coloured in a thick section ; paraphyses coherent, rather 

 thickened and brown tow^ards the apices ; spores oblong or 

 fusiform, usually 1-septate, sometimes simple or faintly 2-3-septate, 

 0,013-18 mm. long, 0,004-6 mm. thick ; hymenial gelatine bluish 

 then sordid-wdne-red with iodine. — Lecidea cumulata Sommerf. 

 Suppl. Fl. Lapp. p. 157 (1826). L. conglomerata Cromb. in 

 Orevillea xxii. p. 59 (non Ach.). 



