ATJ5CTORIA.] ALECTORIFT. 21 I 



margin thin, at length excluded ; spores 0,021-35 mm. long, 0,015 

 -20 mm. thick. Carroll, Journ. Bot. 1865, p. 287 ; Cromb. Lich. 

 Brit. p. 24; Leigh*. Lich. Fl. p. 87, ed. 3, p. 78. Gornicvdaria 

 oshrolenca ft. nigricans Ach. Lich. Univ. (1810) p. 615. Brit. Exs. : 

 Cromb. n. 19. 



The thallus, which is at length free, and, except in colour, like that of 

 A. ochroleuca, is often blackish almost throughout, though sometimes 

 only towards the apices. When long preserved in herbaria it becoiiies 

 reddish, and tinges the paper of the same colour. The apothecia have 

 been found only in Labrador and Arctic N. America. With us the sper- 

 mogones are not uncommon. They are somewhat protuberant, most 

 frequent towards the apices, with spermatia 0,007 mm. long, about 0,001 

 mm. thick. 



Hub. Among mosses on the ground and on rocks, in alpine and sub- 

 alpiue situations. Distr. Somewhat local, but usually plentiful on several 

 of the higher Grampians, Scotland ; very sparingly on mts. in X. Wales ; 

 doubtfully on those of N. England. B. M. : Cwm Bychan, Merioneth- 

 shire ; The Glyders and Carnedd Llewelyn, Carnarvonshire ; ? Teasdale, 

 Durham. Ben Lawers and Mael Girdy, Perthshire; Ben-y-Gloe and 

 Cairn Gowar, Blair Athole ; Ben-naboord, Morrone, and Ben Macdhui, 

 Braemar, Aberdeenshire ; Ben Nevis, Inverness-shire. 



5. A. jubata Xyl. ex Cromb. Journ. Bot. 1872, p. 233. Thallus 

 elongate, pendulous, filiform, subrounded, somewhat rigid, much 

 branched, sorediiferous, olive-brown or brownish black, rarely 

 paler ; branches entangled, smooth, subconcolorous at the apices 

 (K~, CaCl~). Apothecia innato-sessile, affixed to geniculations of 

 the thallus, small, plane or convex, the margin entire, at length 

 excluded ; spores 0,006-9 mm. long, 0,004-5 mm. thick. Gray, 

 Nat. Arr. i. p. 408 ; Hook. Fl. Scot. ii. p. 67; Sm. Eng. Fl. v. p. 227 ; 

 Tayl. in Mack. Fl. Hib. ii. p. 86 ; Mudd, Man. p. 70 pro parte ; 

 Cromb. Lich. Brit. p. 24 pro parte ; Leight. Lich. Fl. p. 88 pro 

 parte, ed. 3, p. 80. Lichen jubatus Linn. Sp. PI. (1753) p. 1155 

 pro parte ; Huds. Fl. Augl. p. 46 1 pro parte : Lightf. Fl. Scot. ii. 

 p. 891 pro parte ; With. Arr. ed. 3, iv. p. 46 ; Eng. Bot. t. 1880 pro 

 parte. Usnea jubata nigricans Dill. Muse. 64, t. 12. f. 7. Lichen- 

 oides quod Muscus corallinus saxatilis fveniculac-eus Dill, in Ray Syn. 

 p. 65, n. 7. Brit. Exs. : Leight. n. 72 ; Mudd, n. 37 ; Cromb. 

 n. 128 (pallidior) : Bohl. n. 83. 



The thallus of this well-known plant, of which the type is A. prolixa 

 Ach. Lich. Univ. p. 592, is in its young state suberect, as it frequently 

 appears on old fir pales. Usually it is more or less sprinkled with whitish 

 or greyish soredia, which are especially abundant in the less elongate or 

 suberect states. It is one of our most social lichens, frequently along 

 with Usneas completely covering the trunks and branches of firs in 

 Highland woods and forests. The apothecia are extremely rare in Great 

 Britain, owing, no doubt, to so many old forests having been felled. The 

 spermogones, which are also very rare, are inclosed in scattered thalline 

 tubercles, with spermatia 0,006-7 mm. long, about 0,005 mm. thick. 



Hab. On the trunks and branches of old trees, chiefly pine and larch, 

 as also on boulders among mosses, in wooded upland and subalpine regions. 



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