214 LICHENACEL. [ALECTORIA. 
7. A. bicolor Nyl. Mém. Soc. Cherb. v. (1857) p. 98.—Thallus 
filiform, erect, very much and divaricately branched, densely intri- 
cate, black or brownish-black ; branches short, slender, rounded, 
patent, subfibrillose, the apices usually somewhat curved and pale- 
brown (K~, CaCl7). Apothecia lateral, small, blackish ; spores 
shortly ellipsoid, 0,007-8 mm. long, 0,005-6 mm. thick.—Mudd, 
Man. p. 70; Cromb. Lich. Brit. p. 23; Leight. Lich. Fl. p. 86, ed. 3, 
p. 78.—Cornicularia bicolor Gray, Nat. Arr. i. p. 405 ; Hook. FI. 
Scot. ii. p.69; Sm. Eng. FL v. p. 229. Lichen bicolor Ehrh. Beytr. 
iii. (1789) p. 82; Eng. Bot. t. 1853. Lichen lanatus Huds. FI. 
Angl. p. 461 ; Lightf. Fl. Scot. ii. p. 892; With. Arr. ed. 3, iv. p. 57. 
Usnea lane nigre instar saxis adherens Dill. Muse. 66, t. 13. f. 8. 
Muscus coralloides lane nigre instar, saais adherens Dill. in Ray, 
Syn. ed. 3, p. 65, n. 3.— Brit. Evs.: Mudd, n. 39; Cromb. n. 127. 
Though allied to A. jubata, of which it has been regarded as a variety, 
yet, in the absence of any intermediate states, this is a very distinct 
species. The apices of the thallus, which is at length free, are frequently 
concolorous with the branches (var. melaneira Ach, Lich, Univ. p. 614); 
but this evidently results from exposure. The apothecia have been 
gathered only in the Himalaya Mts. The spermogones are very minute, 
more frequent towards the apices, with spermatia 0,008 mm. long, about 
0,0005 mm. thick. 
Hab. On rocks and boulders among mosses in upland and subalpine 
tracts.— Distr. Frequent and sometimes abundant in mountainous tracts 
of W. and N. England, N. Wales, and the Highlands of Scotland, but 
apparently very rare in N.E. Iveland.—B. M.: “lay Tor and Lustleigh 
Cleeve, Dartmoor, Walkington, Devonshire ; Helminton, Cornwall ; Capel 
Arthog, Llyn Bodlyn, and Cader Idris, Merionethshire; Island of Angle- 
sea; Farndale, Yorkshire; Teesdale, Durham; Kentmere, Westmore- 
land. New Galloway, Kirkcudbrightshire; Ben-A’an, near Taymouth, 
Ben Lawers, Ben More, Glen Lyon, Corrie Uachlar, Rannoch, and Ben- 
y-Gloe, Perthshire ; Canlochan, Forfarshire ; Lochnagar, Aberdeenshire ; 
Ben Luighal, Sutherlandshire. Co. Antrim. 
Tribe XII. CETRARIEI Nyl. Mém. Soc. Cherb. iii. 
(1855) p. 172; Syn. i. p. 297. 
Thallus subfruticulose or foliaceous, compressed or rarely rounded, 
erect, ascending, or appressed, occasionally sparingly rhizinose be- 
neath, internally filled with a white woolly medulla. Apothecia 
lecanorine, marginal, obliquely affixed to the lacinia ; spores 8ne, 
small, simple, colourless; paraphyses not discrete. Spermogones 
enclosed in setuliform apiculi or biack papille; sterigmata subsimple 
or pauci-articulate. 
In habit and general appearance this tribe approaches some of the 
Alectoriet, though in more important respects it is allied to the Par- 
meliei. Having regard, however, to the usually fruticulose thallus 
the situation of the apothecia, and the character of the spermogones, 
it is entitled to be separated from both. Most of the European species are 
found in Britain. 
