. A monograph of lichens found in Britain; being a descriptive catalogue of the species in the herbarium of the British Museum. Lichens. CEXEABIA.] CETRAKIW. 219 Form 2. acanthella Nyl. Mem. Soc. Cherb. v. (1857) p. 100.— Thallus as in the type, but very mucb. spinuloso-denticulate tbrough- out. Apothecia few.—Cromb. Journ. Bot. 1870, p. 96; Leight. Lich. Fl. p. 98, ed. 3, p. 93.—Cornicvlaria spadieea y. acanthella Ach. Lich. Univ. (1810) p. 612. Coralloides frutieuli specie fuscum, spinosum DiLl. Muse. 112, t. 17. f. 31 b. Distinguished by the entirely hispido-spinulose or set^lose thallus. I
. A monograph of lichens found in Britain; being a descriptive catalogue of the species in the herbarium of the British Museum. Lichens. CEXEABIA.] CETRAKIW. 219 Form 2. acanthella Nyl. Mem. Soc. Cherb. v. (1857) p. 100.— Thallus as in the type, but very mucb. spinuloso-denticulate tbrough- out. Apothecia few.—Cromb. Journ. Bot. 1870, p. 96; Leight. Lich. Fl. p. 98, ed. 3, p. 93.—Cornicvlaria spadieea y. acanthella Ach. Lich. Univ. (1810) p. 612. Coralloides frutieuli specie fuscum, spinosum DiLl. Muse. 112, t. 17. f. 31 b. Distinguished by the entirely hispido-spinulose or set^lose thallus. In this country the apothecia are very rare. The spermogones are frequently present in herbaria specimens. Hab. On the ground among mosses in upland districts.—Distr. Local and scarce in W. and N. England, N. Wales, and among the N. Gram- pians, Scotland.—B. M. : Clifton, near Bristol; Dolgelly, Merionethshire ; Farndale, Yorhshire; Prestwick Carr, Northumberland. Clova Mts., Forfarshire; Hill of Ardo near Aberdeen, S. of Lochnagar, Braemar, Aberdeenshire ; Glen Nevis, Inverness-shire. 5. C. odontella Ach. Syn. (1814) p. 230.—Thallus densely fru- ticuloso-caespitose, depressed, narrowly laciniate; laciniae plane, linear, thin, palmately ramoso-divided, spinulose at the margins, spadiceous, chestnut-brown or pale spadiceous, paler at the base, or sometimes blood-coloured (K~, CaCl~). Apothecia terminal, coneolorous, the margin denticulate ; spores 0,007-010 mm. long, about 0,0045 mm. thick.—Cromb. Journ. Bot. 1882, p. 272.—Lichen odontellus Ach. Prodr. (1798) p. 213. This usually forms minute depressed tufts, andsomewhatresembles form hispida ai the preceding species, but is distinguished bv the plane thin laciuiae. The thallus closely allies it to C. crispa, from which it is, however, separated by the characters given. In the only specimen found in this country, apothecia and spermogones are absent. Hob. Among mosses on rocks in alpine tracts.—Distr. A single s
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