204 IICHENACEI. [USNEA. 



rate, concave, pale or flesh-coloured, fibrilloso-ciliate at the margins ; 

 spores shortly ellipsoid, 0,009-11 mm. long, 0,006-7 mm. thick. — 

 Cromb. Journ. Linn. Soc. Bot. xvii. p. 555. — Usaea barbata d.dasy- 

 jioga Mudd, Man. p. 69; Cromb. Lich. Brit. p. 23; Leight. Licb. 

 Fl. p. 84, ed. 3, p. 76, Usnea jjUcata y. dasypncja Ach. Meth. 

 (1803) p. 312. Usnea barbata Hook. Fl. Scot. ii. p. 70 pro parte ; 

 Sm. Eng. Fl. v. p. 231 pro parte. Lichen barbatus Huds. Fl. Angl. 

 p. 462 ; Lightf. Fl. Scot. ii. p. 890 ; Eng. Bot. t. 258. f. 2. Usnea 

 barbata loris tenuibus fibrosis Dill. Muse. 63, t. 12. f. 6. — The specific 

 name of barbatus Linn, having been applied to the aggregate species 

 of recent authors, it is better to adopt the later name in order to 

 prevent confusion. 



Distinguished from ZJ.fiorida by the elongat'^, pendulous thallus with 

 its long divergent branches, and by the smaller and fewer apothecia. 

 Tlie thallus, as is the case iu other species, is in old plants sometimes 

 very sparingly articulate towards the base, and occasionally also con- 

 sists merely of one or two elongate branches, which at first sight are not 

 unlike those of U. lomjiasima Ach., which does not occur iu this country. 

 It is often widely spreading and oephalodiiferous, and from its appear- 

 ance is best entitled to the name of " bearded." With us it is very 

 rarely seen in fruit ; when present the apothecia are scattered and chiefly 

 subtermiual. 



Sah. On the trunks of trees, chiefly firs, in wooded upland tracts. — 

 Distr. Somewhat local in S. and N. England, N. Wales ; more common 

 among the Grampi ms, Scotland ; not seen from Ireland. — B. M. : Dart- 

 moor, Lydford, and near Totnes, S. Devon ; near Dolgelly and Khew- 

 greidden, Merionethshire ; Ilafod, Cardiganshire ; Teesdale Furest, Dur- 

 ham ; lugleby, Cleveland, Yorkshire ; Lamplugh, Cumberland. New 

 Gallowaj', Kirkcudbriglitshire ; Loch Ard, Killiu, and Ben Lawers, 

 Perthshire ; Deerhill Wood, Forfarshii-e ; Mar Forest, Aberdeenshire ; 

 Rothiemurchus Woods, luveruess-shire. 



A^ar. /3. plicata Xyl. Flora, 1885, p. 299.— Thallus smooth, sub- 

 dichotomously branched ; branches lax, entangled, subarticulate, 

 very sparingly or non-tibrillose, the ultimate ones capilla^3^ Apo- 

 thecia somewhat small, concave or at length plane. — Cromb. Gre- 

 villea, XV. p. 48. — Usnea barbata y. plicata Mudd, Man. p. 69 pro 

 parte ; Cromb. Lich. Brit. p. 23 pro parte ; Leight. Lich. Fl. p. 85 

 pro parte, ed. 3, p. 76 pro parte. Usnea plicata Gray, J^at. Arr. i. 

 p. 403 (excl. vars.) ; Hook. Fl. Scot. ii. p. 70 ; Sm. Eng. Fl. p. 226. 

 Lichen plicatus Ach. Prodr. (1798) p. 225; Eng. Bot. t. 257 

 (atypical, and referable rather to das)/por/a). — As there is no speci- 

 men of Lichen plicatus in Herb. Linn., it is very doubtful if this be 

 the plant he intended by that name. 



This, regarded by Nylander as a variety of U. dasi/pof/a, has been little 

 understood by lichenologists. It is distin<i-uished by the thallus being 

 quite smooth, very sparingly fibrillose (in its more typical state efibril- 

 lose), and the branches more lax and entangled. The older branches are 

 somewhat articulato-diffract, and the ultimate ones attenuate, filiform. 

 Only one of our British specimens is quite typical and well fertile. 



Huh. On the branches of trees, chiefly larch, in wooded mountainous 



