180 LECANO-LECIDEEI [bUBLLIA 



p. 178 ; Tayl. ia Mackay Fl. Hib. ii. p. 122 ; Cromb. Lich. Brit, 

 p. 93 ; Leight. Lich. Fl. p. 304 ; ed. 3, p. 316. 

 Exsice. Larb. Lich. Hb. n. 146. 



Has much the general aspect of raore developed states of Baddia 

 flavovirescens, of which it was subsequently regarded by Acharius as 

 a variety. Apart, however, from other characters, it differs in the 

 anatomical structure of the apothecia. In the British specimens the 

 thallus usually forms small orbicular patches. The apothecia are 

 numerous, often aggregate and confluent, arranged as it were in 

 circles. 



Hab. On the ground, rarely encrusting mosses on rocks in moun- 

 tainous districts, generally associated with Bceomyces rufus. — Distr. 

 Very local and scarce on the Grampians, Scotland, and in W. Ireland. 

 — B. M. Ben Lawers, Craig Tulloch, and Eannoch, Perthshire; 

 Canloohan, Forfarshire ; Morrone, Braemar, Aberdeenshire ; near 

 Kylemore, Connemara, Galway. 



Form athallina A. L. Sm. — Thallus absent ; apothecia para- 

 sitic ; otherwise as in the type. — Lecidea scdbrosa i. athallina 

 Nyl. ex Norrl. in Not. Sallsk. Faun. & Fl. Fenn. n. ser. x. p. 341 

 (1873). 



In one of the two British specimens there are traces of the proper 

 thallus, which probably is always normally present, though obliterated, 

 as in other instances, by the more' vigorous growth of the host. 



Hab. On the thallus of Bceomyces rufus in mountainous regions. 

 —Distr. Eare on the Grampians, Scotland. — B, M. Ben Lawers, 

 Perthshire ; Braemar, Aberdeenshire. 



30. B. alpicola Krempelh. Lich.-FI. Bay. p. 200 (1861).— 

 Thallus subdeterminate, thickish, areolate, the areolse rather 

 large, continuous or somewhat scattered, plane or slightly 

 convex, bright-yellow (K -f deep yellow, at length orange-red, 

 CaCl — , meduUa I — ) ; hypothallus black, distinct. Apothecia 

 black, appressed, plane and thinly margined, at length often 

 slightly convex, sessile, and immarginate ; hypothecium brownish- 

 black ; paraphyses concrete, black at the apices, spores ellipsoid, 

 greenish - black, 0,018-28 mm. long, 0,010-15 mm. thick; 

 hymenial gelatine deep-blue with iodine. — Lecidea alpicola 

 Nyl. in Act. Soc. Linn. Bord. ser. 3, i. p. 388 (1856) ; Cromb. in 

 Journ. Bot. viii. p. 99 (1870) ife in GrevUlea iii. p. 143; 

 Leight. Lich. Fl. p. 315 ; ed. 3, p. 328. L. geographica var. 

 alpicola Schser. Spicil. p. 124 (1828) & Enum. p. 106. L. atro- 

 virens var. alpicola Wahlenb. Fl. Lapp. p. 474 (1812) pro parte. 



Externally subsimilar to states of Bhizocarpon geographicum, 

 with which, at first sight, it might readily be confoimded. It differs, 

 in the rather larger areolse and apothecia, and more especiallj' in the 

 1-septate shorter spores and the thalhne reaction mth hydrate of 

 potash. Apparently one of our rarer British lichens. 



Hob. On quartzose and whinstone rocks and boulders in alpine 



