480 licht:>-acei. [lecanoea. 



confounded, but, among other distinctive characters, differs essentially in 

 the type of the gouidia, which ^f/e Th. M. Fries (Lich. Scand. p. 289) 

 are 0,U2U-32 mm. in diameter. The British specimens are well fertile, 

 with the apothecia either scattered or several crowded (as in the ligui-e 

 of Acharius) and then somewhat Hexuose at the margin. 



Jlab. On calcai'eous and schistose rocks in upland and subalpine 

 districts. — Distr. Very sparingly in X. Enghind and among tho 

 Grampians, Scotland. — B. M. : Teesdale, Durham : Mardale, Westmore- 

 land. Craig Calliach and Craig Tulloch, Perthshire ; MoiTone, Braemar, 

 Aberdeenshire. 



180. L. chiysophana Xyl. ex Stiz. St. Gall. Xat. Ges. 18S1, 

 p. 385. — Thallus ctfuse, thin, rimuloso-areolate, sordid- or chesnut- 

 rcddish, when dry at length dark green (K — , CaCl — ). Apothecia 

 minute, concave, blackish-green ; the thalline margin thin, at length 

 excluded; epithecium greenish; spores 8nsc, ellipsoid, 0,0U9-12 

 mm. long, 0,005-7 mm. thick ; hymenial gelatine bluish with 

 iodine. — Cromb. Journ. Bot. 1SS2, p. 274. — Asjjicilia clirysojyhana 

 Xoerb. Sjst. Lich. Germ. (1855) p. 159. 



Distinguished at once by the colour of the thallus and fi-uit from the 

 other British species of this subsection. The chrysogonidia (fide Arnold) 

 are 0,036-4-5 mm. long, 0,025—30 mm. thick, in om- few specimens the 

 apothecia are rather scattered, though here and there a few are con- 

 gregate. 



Sab. On quartzose rocks and stones in alpine situations. — Distr. 

 Extremely local and rare on two of the higher Grampians, Scotland. — 

 B. M. : Above Loch-na-Gat, Ben Lawers, Perthshire ; Ben-naboord, 

 Braemai", Aberdeeushu-e. 



0. Apothecia lecanorine, not immersed ; spores 8nae, simple, 

 colourless. Spermogones with subarticulate sterigmata and 

 ellipsoid spermatia. 



181. L. decincta Xyl. Flora, 1882, p. 452. — Thallus determinate, 

 thin, smooth, rimulose, umbriue, greyish at the circumference 

 (K. — , CaCl— ). Apothecia snbmoderate, plane, black, opaque, 

 internally subincolorous or brownish, the thalline margin not 

 prominent; spores 8nae, ellipsoid, 0,010-14 mm. long, 0,006-8 

 mm. thick; paraphyses discrete, snbmoderate, thicker and brown 

 towards the apices ; hymenial gelatine pale-blue and then (especially 

 tho thecae) tawny with iodine. — Cromb. Grevillea, xii. p. 89. 



Allied to L. intercincta Xyl., with which it constitutes a distinct 

 section {vide Nyl. Flora, 1881,' p. 531) characterized by the form of the 

 sterigmata and spermatia. From L. intercincta, which does not occm* in 

 Britain, it ditfers chieliy in the colour of the thalline margin of the 

 apothecia and in the larger spores. In the single specimen seen the 

 apothecia are numerous, somewhat small, and the spermogones frequent, 

 with spermatia 0,0025-35 mm. long, 0,0015 mm. thick. 



Hab. On schistose rocks in a hilly locahty. — Distr. Very local and 

 scarce in N.W. England.— B. M. : Red Screes, Westmoreland. 



