biatorina] lbcideace.e 113 



One of the rarest British lichens. The squamules, either con- 

 tiguous or scattered, are at times so minute and crowded in the centre 

 that the thallus appears as if warted and cracked. The apothecia, 

 densely conglomerate, very rarely solitary, are usually situated between 

 the squamules. The single British specimen gathered is but 

 sparingly fertile and spores are undeveloped. 



Hah. On the ground in an alpine situation. — B. M. Near the 

 summit of Ben Avon, Braemar, Aberdeenshire. 



5. B. lutea Arnold in Flora xlii. p. 152 (1859).— Thallus effuse, 

 very thin, leprose, greyish-white (K — , CaCl — ), at times almost 

 evanescent. Apothecia moderate in size, sessile, at first concave 

 then plane or slightly convex, deep-yellow or yellowish-orange, 

 the margin entire, thin, often flexuose, paler ; paraphyses 

 coherent ; spores oblong or fusiform-oblong, 0,009-13 mm. long, 

 0,004-5 mm. thick ; hymenial gelatine pale-bluish then violet 

 with iodine. — Mudd Man. p. 177. Lichen luteus Dicks. Crypt, 

 fasc. i. p. 11, t. 2, f. 6 (1785); With. Arr. ed. 3, iv. p. 25; 

 Engl. Bot. t. 1263; Leight. Angioc. Lich. t. 14, f. 3. Lecidea 

 melizea Ach. Lich. Univ. p. 194 (1810) ; S. F. Gray Nat. Arr. 

 i. p. 474. L. lutea Borr. ex Hook, in Sm. Engl. Fl. v. p. 185 

 (1833); Tayl. in Maokay Fl. Hib. ii. p. 129; Cromb. Lich. Brit. 

 p. 63; Leight. Lich. Fl. p. 317 ; ed. 3, p. 341. 



The apothecia are occasionally large, with an inflexed more or less 

 lobulate margin (f. suhlohulata Cromb. in Grevillea xxii. p. 8). The 

 spermogones are not unfrequent in our specimens ; they are urceolate 

 and might readily be taken for young apothecia. 



Hah. On the bark of trees and on mossy trunks in maritime and 

 upland districts. — Distr. Here and there in England, Wales, and 

 Ireland, rare in the S.W. Highlands of Scotland and in the Channel 

 Islands. — B. M. Rozel, Jersey ; Danny and Hurstpierpoint, Sussex ; 

 New Forest, Hants ; Holne Chase and Ullacombe near Bovey Tracey, 

 Devon ; Launceston, Tregawn, near Withiel and Penzance, Cornwall ; 

 Barmouth, Merioneth; Llandyssil, Cardiganshire; Inverary and 

 Barcaldine, Argyll ; near Belfast, Antrim ; Ardrum and Enniskean, 

 Cork ; Askew Wood, Dunkerron, Glengariff and Killarney, Kerry ; 

 Lough Inagh, Connemara, Gal way. 



6. B. diluta Th. Fr. Lich. Arct. p. 185 (I860).— Thallus 

 effuse, very thin, leprose, greenish- or greyish-white (K — , 

 CaCl — ), often evanescent. Apothecia superficial, minute, 

 concave, margined, pale-reddish-yellow or whitish-flesh-coloured, 

 the margin paler, smooth, thickish ; hypothecium colourless ; 

 spores fusiform, 0,009-10 mm. long, 0,003-4 mm. thick ; 

 hymenial gelatine pale-bluish with iodine. — B. pineti Massal. 

 Pvic. Lich. p. 135 (1852) ; Mudd Man. p. 176. Peziza diluta 

 Pers. Syn. p. 668 (1801). Lichen jpineti Schrad. ex Ach. Meth. 

 p. 68 (1803). L. effusus Sm. Engl. Bot. t. 1863, two lower 

 figures (1808) (non Ach.). Lecidea pineti Ach. Lich. Univ. 

 p. 195 (1810); Hook, in Sm. Engl. Fl. v. p. 183; Cromb. Lich. 



II. I 



