128 LECANO-LECIDEEI [bIATORINA 



long, 0,0025-35 mm. thick ; hymenial gelatine deep-blue with 

 iodine — B. mclast'ujina Mudd Man. /. c. Lecidea chalyheia Borr. 

 in Engl. Bot. Suppl. t. 2687, fig. 2 (18.31); Nyl. in'Mem. Soc. 

 Chei-b. ii. p. 333 (1854); Hook, in Sm. Engl. Fl. v. p. 176; 

 Cromb. Lich. Brit. p. 91 ; Leight. Lich. Fl. p. 312 ; ed. 3, p. 327. 

 Lecidea melastigma Tayl. in Mackay Fl. Hib. ii. p. 115 (1836); 

 Leight. Lich. Fl. ed. 3, p. 331. 



Exsicc. Larb. Lich. Hb. nos. 148, 149 ; Johns, n. 393. 



Apt to be confounded with states of B. lenticularis to which it is 

 intimately related, but easily distinguished by the colour of the 

 apothecia and more especially by the dark hypothecium and 

 epithecium. The apothecia are usually scattered and numerous. 

 The spermogones are minute, semi-immersed, black, with shortly 

 ellipsoid spermatia, 0,002-8 mm. long, 0,001 mm. thick. 



Hah. On siliceous rocks and stones in maritime and upland 

 tracts. — Distr. Somewhat rare throughout the British Isles. — B. M. 

 St. Ouen's Bay, Jersey ; Patcham, Aldrington Beach, near Brighton 

 and the South Downs, Sussex ; Lamynack Carne, near Penzance, 

 Cornwall ; Fishguard Harbour, Pembrokeshire ; Trefriw Falls, Carnar- 

 vonshire ; Bilsdale, Yorkshu'e ; St. Bees, Cumberland ; Ben Lawers, 

 Perthshire ; Portlethen, Kincardineshire ; Craig Guie, Braemar, 

 Aberdeenshire ; near Cork ; Duncarron, Kerry ; near Kylemore, 

 Letterbeg and Glencorbot, Connemara,|Galway. 



Subsp. chloroscotina A. L. Sm. — Thallus more deeply cracked, 

 greyish-green. Apothecia somewhat plane and wrinkled ; hypo- 

 thecium brownish-black, the hymenium bluish (K + violet) ; 

 spores 1-septate, sometimes simple, 0,008-16 mm. long, 

 0,003-4 mm. thick, hymenial gelatine bluish then tawny-reddish 

 with iodine. Spermogones and spermatia as in the species. — 

 Lecidea chloroscotina Nyl. in Flora Ix. p. 565 (1877) & Ixv. p. 456 

 <1882); Cromb. in Grevillea vi. p. 113; Leight. Lich. Fl. ed. 3, 

 p. 352 pro parte. 



Exsicc. Larb. Lich. Hb. n. 180. 



Distinguished from the species by the thicker more deeply cracked 

 thallus and the somewhat large spores which are sometimes simple. 



Hab. On moist siliceous stones in streams. — Distr. Very local, 

 though common where it occurs in W. Ireland and (Jide Nylander) in 

 N.W. England (Kentmore, Westmoreland). — B. M. Between Lough 

 Feagh and Lough Muck, Connemara, Galway. 



31. B. dolosa A. L. Sm. — Thallus determinate, thin, minutely 

 granular, olive or tawny-olive-brown. Apothecia minute, plane, 

 dark-brown, with a thin paler margin, becoming somewhat 

 convex and immarginate ; hypothecium colourless ; paraphyses 

 slender, brown at the clavate apices; spores ellipsoid, 0,01 1-12 mm. 

 long, 0,005-6 mm. thick ; hymenial gelatine bluish then dark- 

 violet with iodine. — Lichen dolosus Sm. Engl. Bot. t. 2581 (1814) 

 (non Ach.). Lecidea Gagei Hook, in Sm. Engl. Fl. v. p. 177 

 (1833) ; Tayl. in Mackay Fl. Hib. ii. p. 120. L. lenticularis var. 

 ■Gagei Cromb. in Journ. Bot. ix. p. 179 (1871). 



