TELOCHISTES | ; PHYSIACEE 191 
discoid, with a thalline margin; hypothecium colourless ; para- 
physes simple, or shortly branched at the apices, septate ; spores 
8 in the ascus, colourless, polarilocular, 1-septate, rarely more- 
septate. 
This and the following genus have been included in Physcia by 
recent British authors. It is distinguished by the fruticose character 
of the thallus, and by the colour of the spores; the fibrous cortex 
gives the necessary support to the fronds. 
1. T. flavicans Norm. |. c.—Thallus erect or almost decum- 
bent, yellow or orange-yellow, the fronds narrow, cylindrical or 
somewhat compressed, branched and entangled, often minutely 
nodulose, and fibrillose at the apices; yellowish-white soralia 
frequent (K +"), Apothecia lateral, moderate in size, 
becoming plane or convex, reddish-yellow, the margin thin, 
subcrenulate ; spores polarilocular, 12-18 » long, 7-11 » thick.— 
Muscus arboreus aureus segmentis capillaceus brevibus Buddle Hort. 
Sicc. fol. 9, n. 7 in Herb. Sloane. Muscus aureus tenuissimus 
Dill. in Ray Syn. ed. 3, p. 65, n. 8 (1724). Usnea capillacea 
citrina, fruticuli specie Dill. Hist. Muse. p. 73, t. 13, f. 16 (1741). 
Lichen vulpinus Huds. Fl. Angl. p. 462 (1762) non Linn. ; Lightf. 
Fl. Scot. ii. p. 896; With. Arr. ed. 3, iv. p. 49. DL. flavicans 
Swartz Fl. Ind. Occid. ii. p. 1908 (1788); Engl. Bot. t. 2113. 
Parmelia flavicans Ach. Meth. Lich. p. 268 (1803); Tayl. in 
Mackay Fl. Hib. ii. p. 147. Borrera flavicans Ach. Lich. Univ. 
p. 504 (1810); Hook. Fl. Scot. ii. p. 57 & in Sm. Engl. FI. v. 
p- 224; var. leta Ach. Syn. Lich. p. 225 (1814). Physcia 
flavicans DC. FI. Fr. vi. p. 189 (1815); Mudd Man. p. 112, t. 2, 
f. 33; Cromb. Lich. Brit. p. 37; Leight. Lich. Fl. p. 141; ed. 3, 
p. 130. Borrera leita 8. F. Gray Nat. Arr. i. p. 435 (1821). 
Easicc. Carroll Lich. Hib. nos. 5, 6; Cromb. n. 48; Larb. 
Cesar. n. 21; Leight. n. 169; Mudd n. 84. 
Though usually of a beautiful golden colour, it varies in becoming 
a dull green in the shade and is sometimes paler on one surface. 
The apothecia are very rare in British specimens; the spermogones 
are more frequent. 
Hab. On trees and shrubs, sometimes on rocks or walls, chiefly 
in maritime districts.— Distr. Usually plentiful where it occurs, in 
S. and W. Scotland, N. Wales, 8. Ireland and formerly in S.W. 
Scotland (Ailsa Craig)—b. M. Sark; Alderney; Guernsey; Jersey ; 
Boconnoe, Penzance, Withiel and Bede, Cornwall; near Totnes, 
Dartmoor, Becky Falls, Lydford, Widdicombe, South Brent and 
Torquay, Devon; Boldrewood and Brockenhurst, New Forest, Hants ; 
near Ventnor, Shanklin, Appuldurcombe and Ryde, I. of Wight; 
Ardingly, Up Park, St. Leonards Forest, near Hastings, Fairlight 
Glen and Lewes, Sussex; Dungeness and Lydd, Kent; Malvern Hills, 
Worcestershire; Aberdovey and Barmouth, Merioneth; Holyhead, 
Anglesea; Killarney, Kerry; Whiting Bay, Waterford; near Cork, 
Castlebernard Park, Bandon and Cape Clear, Cork; Lambay Island, 
Dublin. 
