USNEA| USNEACEE 181 
spores ellipsoid, 9-11 » long, 6-7 » thick.—S. F. Gray Nat. Arr. 
i. p. 404 pro parte; Hook. FI. Scot. ii. p. 70 pro parte; var. 
dasopoga Scher. Enum, p. 4 (1850); Mudd Man. p. 69; f. 
dasypoga Cromb. Lich. Brit. p. 23 (1870); Leight. Lich. Fl. 
p. 84 (1871); ed. 3, p. 76. U. plicata var. dasopoga Ach. Meth. 
Lich. p. 312 (1803). U. dasypoga Stiz. in Verh. St. Gall. Nat. 
Ges. p. 202 (1876); Cromb. in Journ. Linn. Soc. xvii. p. 555 
(1880) & Monogr. i. p. 203. Usnea barbata, loris tenuibus fibrosis 
Dill. Hist. Musc. p. 63, t. 12, fig. 6 (1741). Lichen barbatus 
L. Sp. Pl. p. 1155 (1753)? Huds. Fl. Angl. p. 461 (1762) ; Lightf. 
FL. Scot. ii. p. 890. L. articulatus Sm. Engl. Bot. t. 258, fig. 2 
(1795). 
Exsice. Johns. n. 219. 
Distinguished among pendulous species by the more slender 
minutely scabrous branches and by the crowded horizontal fibrils on 
the older parts of the thallus. 
Hab. On the trunks of trees, chiefly firs, in wooded upland regions. 
—Distr. Rather rare in England, commoner among the Grampians, 
Scotland.—B. M. Rhewgreidden, Merioneth; Teesdale Forest, Dur- 
ham; Ingleby, Cleveland, Yorkshire; Stronachlachan, Killin and 
Ben Lawers, Perthshire; Deerhi]l Wood, Forfarshire; Mar Forest, 
Aberdeenshire; Rothiemurchus Woods, Invernessshire. 
Var. pendula Heb. Howe Class. Fam. Usn. Amér. Nord. 
Paris, p. 14 (1912).—Thallus smooth, irregularly branched, the 
branches very sparingly or not fibrillose, the ultimate branches 
very slender.—U. plicata Ach. Lich. Univ. p. 622 (1810); Tayl. 
in Mackay FI. Hib. ii. p. 86. U. barbata var. plicata f. pendula 
Scher. Enum. p. 4 (1850). U. dasypoga var. plicata Cromb. in 
Grevillea xv. p. 48 (1886) & Monogr. i. p. 204 pro parte. Lichen 
plicatus Ach. Lich. Suec. Prodr. p. 225 (1798) (non Linn.) ; Engl. 
Bot. t. 257. 
A variety somewhat doubtfully referred to this species, owing to 
the rather dense branches which are, however, almost destitute of 
horizontal fibrils. The references of English authors refer partly to 
this variety and partly to Usnea plicata, under which they are 
quoted. ' 
Hab. On the branches of trees, chiefly larch, in wooded moun- 
tainous regions.—Distr. Rare in Wales, N. England.—B. M. Craig 
Calliach, Perthshire; near Corriemulzie, Braemar, Aberdeenshire ; 
Dulcie by the Findhorn, Elginshire. 
5. U. articulata Hoffm. Deutschl. Fl. ii. p. 133 (1795).— 
Thallus pendulous, elongate, nearly smooth, flaccid, much 
branched, the older primary filaments constricted at intervals, 
the articulations variously inflated, sometimes very large, and 
apart on the central axis, the branchlets slender, sparsely and 
finely fibrillose and entangled, occasionally sorediate, pale greyish- 
green or pale tawny-yellow. Apothecia rare, small, pale, 
