biatoeina] lbcidbace* 111 



p. 805 (1777); With. Arr. ed. 3, iv. p. 10; Engl. Bot. t. 1139. 

 Patellaria vesicularis Hoffm. PI. Lich. ii. p. 30 (1794). Lepi- 

 doma vesiculare S. P. Gray Nat. Arr. i. p. 460 (1821). Lecidea 

 vesicularis Hook. PI. Scot. ii. p. 40 (1821) ; Cromb. Lich. Brit. 

 p. 76 ; Leight. Lich. PI. p. 313. L. cceruleonigricans Schser. 

 Enum. p._ 101 (1850) ; Tayl. in Mackay Pi. Hib. ii. p. 131 ; 

 Leight. Lich. PI. ed. 3, p. 330. Psora cwruleonigricans Hook, in 

 Sm. Engl. PI. V. p. 192 (1833). Thalloidima vesiculare Massal. 

 Eic. Lich. p. 95 (1852) ; Mudd Man. p. 173, t. 3, f. 63. 



Exsicc. Dicks. Hort. Sice. n. 24 ; Bohl. n. 67 ; Leight. n. 335 ; 

 Mudd n. 143; Larb. Caesar, n. 34 & Lich. Hb. n. 230; Cromb. 

 n. 179 ; Johns, n. 377. 



Varying as to the colour and size of the thallus according to the 

 nature of the habitat. The squamules are somewhat discrete or 

 congested smd either pruinose or naked or partly both. The apotheoia, 

 usually more or less scattered, are at times here and there confluent 

 and occasfonally rather large. 



An apparently stunted condition, with the squamules conglomerate 

 (f. glehosa Cromb. in Grrevillea xxii. p. 59), has been found among 

 mosses on rocks. 



Sah. On the ground and in crevices of rocks, chiefly calcareous, in 

 maritime and upland situations. — Distr. Not unfrequent and plentiful 

 where it occurs, in Great Britani ; apparently rare in E. Ireland and 

 the Channel Islands. — B. M. Port Gorey, Sark ; Quenvais, Jersey ; 

 near Ventnor, I. of Wight ; Torquay, Devon ; Bray Hill, St. Miuver, 

 Cornwall ; Cleve Hill, Yatton and Bathf ord Hill, Somerset ; Newhaven 

 and Rottingdean, Sussex; near Bristol, Gloucestershire; Llangollen, 

 Denbighshire ; Thetford Warren, Norfolk ; Gogmagog Hills, Cam- 

 bridgeshire; Ashwood Dale, Buxton, Derbyshire; near Tenby, Pem- 

 brokeshire ; Puffin Island, Anglesea ; Great Orme's Head, Carnarvon- 

 shire ; Oswestry and Llanymynech Hill, Shropshire ; Stutton, York- 

 shire; Teesdale, Durham; Inchkeith, near Edinburgh; near Appin 

 House, Argyll; Ben Lawers and Craig TuUoch, Perthshire; Craig 

 Guie, Braemar, Aberdeenshire ; near Dublin ; near Cork. 



2. B. Candida Jatta Syll. Lich. Ital. p. 372 (1900).— Thallus 

 determinate, squamulose, white, densely white-suffused, the 

 squamules tumid, plicate, congested and imbricate in the centre, 

 lobed at the circumference, the lobes rarely subcrenate at the 

 margins (K— , CaCl — ). Apothecia appressed, moderate, plane 

 or sHghtly convex, black, bluish-grey-pruinose, at length naked, 

 the margin thickish, entire ; hypothecium pale-reddish-brown ; 

 paraphyses subconorete, dark-brown at the apices ; spores fusi- 

 form or fusiform-acicular, 0,016-23 mm. long, 0,003-5 mm. 

 thick ; hymenial gelatine bluish then sordid-wine-red with iodine. 

 —Lichen eandidus Weber Spioil. PI. Goett. p. 193 (1778). 

 Lecidea Candida Ach. Meth. p. 79 (1803) ; Cromb. Lich. Brit, 

 p. 77 ; Leight. Lich. PI. p. 313 ; ed. 3, p. 330. Lepidoma can- 

 didrnn, S. P. Gray Nat. Arr. i. p. 460 (excl. syn. Engl. Bot.) 

 (1821). Thalloidima candidum Massal. Ric. Lich. p. 96, fig. 197 

 (1852); Mudd Man. p. 172. 



