480 LICHEN ACEI. [LECANORA. 
confounded, but, among other distinctive characters, differs essentially in 
the type of the gonidia, which fide Th. M. Fries (Lich. Scand. p. 289) 
are 0,020-82 mm. in diameter. The British specimens are well fertile, 
with the apothecia either scattered or several crowded (as in the figure 
of Acharius) and then somewhat flexuose at the margin. 
Hab. On calcareous and schistose rocks in upland and subalpine 
districts—Distr. Very sparingly in N. England and among the 
Grampians, Scotland.—B. M.: Teesdale, Durham ; Mardale, Westmore- 
land. Craig Calliach and Craig Tulloch, Perthshire ; Morrone, Braemar, 
Aberdeenshire. 
180. L. chrysophana Nyl. ew Stiz. St. Gall. Nat. Ges. 1881, 
p. 885,—Thallus effuse, thin, rimuloso-areolate, sordid- or chesnut- 
reddish, when dry at length dark green (K —, CaCl —). Apothecia 
minute, concave, blackish-green ; the thalline margin thin, at length 
excluded; epithecium greenish; spores 8na, ellipsoid, 0,009-12 
mm. long, ¥,005-7 mm. thick; hymenial gelatine bluish with 
iodine.—Cromb. Journ. Bot. 1882, p. 274.—Aspicilia chrysophana 
Koerb. Syst. Lich. Germ. (1855) p. 159. 
Distinguished at once by the colour of the thallus and fruit from the 
other British species of this subsection. The chrysogonidia (fide Arnold) 
are 0,036-45 mm. long, 0,025-380 mm. thick. In our few specimens the 
apothecia are rather scattered, though here and there a few are con- 
gregate. 
Hab. 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-nabvord, 
Braemar, Aberdeenshire, 
O. Apothecia lecanorine, not immersed; spores 8nex, simple, 
colourless. Spermogones with subarticulate sterigmata and 
ellipsoid spermatia. 
181. L. decincta Ny]. Flora, 1882, p. 452.—Thallus determinate, 
thin, smooth, rimulose, umbrine, greyish at the circumference 
(K —, CaCl—). Apothecia submoderate, plane, black, opaque, 
internally subincolorous or brownish, the thalline margin not 
prominent; spores 8ne, ellipsoid, 0,010-14 mm. long, 0,006-8 
mm, thick; paraphyses discrete, submoderate, thicker and brown 
towards the apices ; hymenial gelatine pale-blue and then (especially 
the thecee) tawny with iodine.—Cromb. Grevillea, xii. p. 89. 
Allied to Z. intercincta Nyl., with which it constitutes a distinct 
section (wde Nyl. Flora, 1881, p. 531) characterized by the form of the 
sterigmata and spermatia. From L. intercincta, which does not occur in 
Britain, it differs chiefly 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 locality Distr. Very local and 
scarce in N.W. England.—B. M.: Red Screes, Westmoreland. 
