rSXEA.J TTSNEEI. 207 



!^^usc. 00, t. 11. f. 4, Licheno'uh's quod AfuKcxs arhoreua no'losui 

 Dill, iu Kay, Syn. p. Go, ii. 4. — Brit. Exs.: Crumb, n. 17; Dicks. 

 Hort. Sic. n. 24. 



Apparently a distinct specie?^, easily recojrnizecl by the articulate tbal- 

 lus and the ionj; capillary tibrils of the lateral branches. The rest of the 

 thallus i3 sometimes nearly etibrillose, and the articulations, few or 

 many, are caused by the transverse rupture of the cortical layer. In this 

 country the apothecia haye neyer been met with, the supposed fruit of 

 the older writers being merely the " cephalodia," which are sometimes 

 very frec^uent and occa;ioiially conglomerate. 



Ilah. On the trunks of aged trees iu old shady woods and forests in 

 upland districts. — Distr. Local and scarce at the present day in Great 

 Jlritain, though before our old woods and forests were so extensively 

 felled it seems to have been much more frequent. — B. ^I. : Charlton 

 I' orest, Sussex ; near Appuldurcomb and Ventnor, Isle of Wight; New 

 Forest, Hants ; near Exeter, Arton, Beckey Falls, Devonshire ; Liskeard, 

 Cornwall: Fntield Chace, Hertfordshire; near Stockeuchurch, Oxford ; 

 Cwm Byclian, near Barmouth, Merionethshii'e ; Burnley, Liincashire. 

 Stronaclachan Woods, Killin, Perthshire; DeerhiU AVoods, Forfarshire ; 

 Rothiemurchus AN'oods, Inverness-shire. 



Form intestiniformis Cromb. Grcvillea, xv. (1886) p. 48. — 

 Thallus prostrate, thick, and intiatcd, here and there coarctate and 

 ventricose : branchlets short, attenuate, flexuoso-interwoven. — 

 Usnea harhata d. Intestimforniis Acb. Lich. Univ. (1810) p. 625. 

 Usnea harhata /3. artlculata Sm. Eng. Fl. v. p. 231. Usnea arti- 

 cidata Tayl. iu Mack. Fl. Hib. ii. p. 86. 



This singular state, evidently depending on the habitat, diSers in the 

 articulations being very much swollen and the branchlets much shorter. 

 It is always infertile. 



Hah. On the gi-ound in sandy tracts in maritime districts. — Distr. 

 Local and scarce in S.W. England and S.E. Ireland ; not recently 

 gathered. — B. M. : Exmoutb "Warren, Devonshire. Malahide, near 

 Dublin. 



Tribe XI. ALECTORIEI Xyl. Flora 1869, p. 444. 



Thallus fruticulose, rounded or compressed, erect or pendulous, 

 decumbent or prostrate, internally with lax, arachnoid medulla, or 

 entirely hollow. Apothecia lecauorine, scutelliform, lateral or 

 pseudo-terminal ; spores usually Snoe, small or moderate, simple, 

 colourless ; paraphyses not discrete. 8permogones immersed or 

 superficial ; sterigmata pauci-ai-ticulate. 



As instituted by Nylander this is a well-defined and natm-al tribe. It 

 is allied to the preceding and following tribes. Of its three genera, iJu- 

 fourea and Daitylina do not occur iu our Islands. 



