LECANORA.] LECAXO-LECIDEEI. 453 



founded. In age the apothecia become somewhat large and convex, with 

 the thalline margin obliterated. 



Hob. On quartzose rocks in mountainous districts. Distr. Only 

 sparingly among the Grampians, Scotland. B. M. : Ben Lawers, 

 Perthshire ; Morrone, Braemar, Aberdeenshire. 



146. L. austera Xyl. Flora, 1874, p. 309. Thallus subdeter- 

 minate, thin, unequal, rimose, cervine or cervine-badious (K , 

 CaCl ); hypothallus thin, black, little visible. Apothecia mode- 

 rate or somewhat large, plane, badio-brownish, often proliferous ; 

 the thalline margin flexuose, often subcrenate, slightly shining ; 

 spores ellipsoid, about 0,009 mm. long, 0,007 mm. thick ; para- 

 physcs moderate, jointed; hymenial gelatine scarcely tinged, but 

 the thecae bluish with iodine. Cromb. Grevillea, iii. p. 23 ; Leight. 

 Lich. Fl. ed. 3, p. 199. 



Closely allied to the preceding species, but differing especially in the 

 less developed thallus and the much shorter spores. The only specimen 

 gathered is well fertile, the apothecia varying as above. The spermo- 

 gones also are frequent, with spermatia 0,004-5 mm. long, scarcely 

 6,001 mm. thick. 



Hob. On weathered quartzose stones, in an alpine locality. Dish-. 

 Very local and scarce on one of the S. Grampians, Scotland". B. M. : 

 Summit of Ben Cruachan, Argyleshire. 



147. L. atriseda Xyl. Act. Soc. Linn. Bord. ser. 3, t. i. (185fi) 

 p. 337 ; Lich. Scand. p. 170. Thallus areolato-granulate, brown or 

 dull- brown ; the granules contiguous or scattered, convex (K , 

 CaCl ) ; hypothallus thin, black, often obsolete. Apothecia moderate, 

 at first immersed, then appressed, plane or somewhat convex, 

 brown or dark-brown ; the thalline margin thin, entire ; spores 

 ellipsoid, obtuse at the apices, 0,008-12 mm. long, 0,005-7 mm. 

 thick ; paraphyses rather stout, not very discrete, brownish at the 

 apices. Cromb. Journ. Bot. 1871, p. 178. Lecanora badia var. 

 atriseda Leight. Lich. Fl. p. 213, ed. 3, p. 198. Parmelia badia 

 y . atriseda Pr. X. Sched. crit. 1827, p. 6 Lich. Eur. p. 149. 

 Lecanora nephcea Somm. Suppl. Lapp. Or. (1826) p. 103, is an 

 abnormal state of this, fide Fr. fil. Lich. Scand. p. 268, and is 

 therefore scarcely to be adopted, though having priority. 



A good species, looking at first sight as if allied to L. squamulosa. In 

 our few British specimens the thallus is determinate with the granules 

 sufficiently contiguous. The apothecia are numerous and crowded, at 

 times almost obliterating the verrucse. The spermogones, which are 

 sparingly present, are impressed, blackish at the apices, with spermatia 

 0,018-20 mm. long, 0,001 mm. thick. 



Hal. On rocks in mountainous districts. Distr. Rare in Wales, X. 

 England, and the X. Grampians, Scotland. B. M. : Dolgelly, Merioneth- 

 shire ; Ennerdale, Cumberland ; Morrone, Aberdeen shire. 



