212 LICHENACEI. [A.LECTORIA. 



Distr. General in the hilly and mountainous tracts of Great Britain 

 very abundant amongst the Grampians, Scotland ; rare in Ireland. B. M : 

 St. 'Leonards, Sussex; New Forest, Hants; Hay Tor, Dartmoor, Devon- 

 shire ; Helminton and Roughton, Cornwall ; Charnwood Forest, Leicester- 

 shire ; Gamlingay Park, Cambridgeshire ; near Kingley, Warwickshire ; 

 near Oswestry, Shropshire ; Dolgelly, Aberdovey, and near Barmouth, 

 Merionethshire ; Baysdale and near Great Ayton, Cleveland, Yorkshire ; 

 Teesdale, Durham ; Keswick and Alston, Cumberland ; The Cheviots, 

 Northumberland. New Galloway, Kirkcudbrightshire; Beld Craig, 

 Moffat, Dumfriesshire ; Pentland Hills, near Edinburgh ; Appin, 

 Argyleshire ; Glen Falloch, Killin (frt.), Ben Lawers, and Knock of 

 Crieff, Perthshire; Deerhill Wood, Forfarshire (frt.); Countesswells 

 Wood, near Aberdeen ; Ballochbuie Forest, Craig Cluny, and Mar Forest, 

 Braemar; Rothiemurchus Woods, Glen Nevis, and Glen Morriston, Inver- 

 ness-shire; Lairg, Sutherlandshire. Killiney Hills, near Dublin ; Luggle- 

 law, co. Wicklow ; near Innishowen, co. Donegal. 



Var. /3. lanestris Ach. Lich. Univ. (1810) p. 593. Thallus some- 

 what small, prostrate, rather soft, very sparingly sorediiferous, 

 brownish-black or blackish ; branches short, slender, densely en- 

 tangled. Apothecia not seen. Cromb. Journ. JBoc. 1872, p. 233. 

 Lichen jubatus Eng. Eot. t. 1880 (upper fig.). 



This variety, which superficially resembles Parmelia lanata, is well 

 distinguished by the smaller, denser, more tender thallus, and by the 

 almost entire absence of soredia. The fructification has apparently never 

 been observed, even in countries where the plant is more common. 



Hab. On old fir pales in mountainous districts. Distr. Local and rare, 

 in W. England and among the Grampians, Scotland ; no doubt to be 

 detected elsewhere. B. M. : Helsby Hill, Cheshire. Killin, Perthshire ; 

 Braemar, Aberdeenshire ; Rothiemurchus, Inverness-shire. 



Form tenerrima Cromb. Grevillea, xv. (1886) p. 48. Thallus 

 smaller, very much branched ; branches short, very slender, fragile, 

 soft and much interwoven. 



At first sight might readily be mistaken for an Ephebe. It is always 

 sterile. 



Hab. On the trunks of old birch trees in upland situations. Distr. 

 Very local and rare among the N. Grampians, Scotland. B. M. : Morrone, 

 Braemar, Aberdeenshire. 



Subsp. 1. A. chalyfoeiformis Nyl. ex Cromb. Grevillea, xv. p. 48. 

 Thallus subfiliform, prostrate, flexuose, rigid, divaricately branched, 

 sparingly sorediate, olive- or brownish-black (or dark leaden- 

 coloured), often a little paler at the apices ; branches short, remote 

 (K~, CaCl~)- Apothecia not seen. Alectoria jubata var. chaly- 

 leiformis Ach. Lich. Univ. (1810) p. 592; Hook. Fl. Scot. ii. p. 67 ; 

 Sm. Eng. Fl. v. p. 227 ; Mudd, Man. p. 70 ; Cromb. Lich. Brit, 

 p. 24 ; Leight. Lich. Fl. p. 89, ed. 3, p. 80. Alectoria chalybei- 

 formis Gray, Nat. Arr. i. p. 408. Lichen chalybeiformis Linn. Sp. 

 'PI. (1753) p. 1155 ; With. Arr. ed. 3, iv. p. 47. Usnea rigida Jior- 

 sum vorsum extensa Dill. Muse. 66, t. 13. f. 10. Liclienoides caule 

 rigido, instar fli chalylei Dill in Ray Syn. ed. 3, p. 65, n. 2. 

 Brit. Krs. : Larb. Lich. Hb. n. 245. 



