76 COLLEMACEI. [lEPTOGIUM. 



lands, Scotland. — B. M. : luverary and Appin, Argyleshire ; Glen Lochay, 

 Glen Lyon, Fortingall, Loch Earn, and Craighall, Perthshire ; Clova, 

 Forfarshire ; Lochaber, Inverness-shire. 



18, L. Hildenbrandii Xyl. Syn. i. (IboS) p. 127.— Thallus small 

 or moderate, monophyllous, nearly orbicular, somewhat lobed and 

 undulate, opaque, slightly rugulose, brownish-green or leaden-brown, 

 beneath greyish-white, with somewhat long, fasciculate rhizinte, 

 Apothecia moderate, plane or convex, the thalline margin entire ; 

 spores ellipsoid, 3-septate, becoming irregularly murali-multilocular, 

 0,016-24 mm. long, 0,09-11 mm. thick.— Cromb. Journ. Bot. 1874, 

 p. 336. — Colhma Hildenbrandii Garov. Lich, It. (1837) n. 1. Li- 

 clien saturninus Sm. Trans. Linn. 8oc. i, (1791) p. 84, 



Distinguished from L. satuniiiutm. to which it is closely allied, by being 

 more monophyllous. usually smaller, and especially by being tibrilloso- 

 rhiziuose on the under surface. In the few British specimens the thallus 

 is rather small, and the apothecia are few and scattered. 



Hab. On the trunks of old trees by streams, in upland mountainous 

 districts. — Distr. Only in Js. England and the S. Grampians of Scotland. 

 — B. M. : Teesdale, Durham. Glenample and Craighall, Perthshire ; 

 Clova, Forfarshire. 



19. L. Burgessii Mont. PI. Cell. ( 1840) p, 129, in "Webb, & Berth, 

 Canar. — Thallus large, laciniato-lobed, complicate, greenish- or 

 leaden-browu. lobes crowded, somewhat imbricate, crenulate, or mi- 

 nutely lacerate and crisp, beneath greyish and more or less minutely 

 tomentose, Apothecia moderate or large, concave or at length some- 

 what plane, reddish-brown or dark-red, the thalline margin sub- 

 foliaceous, crisp and laciniate ; spores ellipsoid, frequently attenuate 

 at both apices, 3-5-septate. and irregularly murali-multilocular, 

 0,030-40 mm. long. 0,013-17 mm. thick. — Cromb, Lich, Brit. p. 9 ; 

 Leight. Lich. Fl. p, 30, ed. 3, p, 33. — Mallotium Burgessii Gray, 

 !Jsat. Arr. i, p, 399 ; 3Judd, Man, p, 45, Collema Burgessii Hook, 

 Fl, Scot, ii, p, 71 ; Sm, Eng. Fl. v, p, 211 ; Tayl. in Mack, Fl, Hib, 

 ii, p, 110. Lichen Burgessii Lightf, Fl, Scot, ii, (1777) p, 827, t, 26 ; 

 Huds, Fl, Angl, ed, 2,' p. 538 : Eng. Bot. t. 300 ; With. Arr. ed. 3, 

 iv. p. 57. — Brit. E.VS. : Cromb. n. 6 : Dicks. Hort. Sic. n. 24. 



This is the largest of the British Colki7iei, and may at once be recognized 

 by the parmelioid thallus and the foUaceous thalline margin of the apo- 

 thecia. Where the plant is rare, it is orbicular and of moderate size, but 

 where it is plentiful it spreads extensively, and is often somewhat pur- 

 plish. The apothecia are numerous and crowded, becoming in old plants 

 nearlv plane, and blackish, with the thalline margin mure or less oolite- 

 rated, 



Hab. On the tnmks of old trees near water (lakes and rivers), rarely 

 found on old walls, in wooded upland districts. — Distr. General, and 

 usually comnutn,in the mountainous tracts of W, Britain ; veiy abundant 

 in the" W. Highlands of Scotland, rarer in W. Ireland. — B. M. : Ivy 

 Bridge and Lidford, S. Devon: Xannau,near Dolgflly, (^vm-Bycllan and 

 Barmouth, Merionethshire ; llafod, Cardiganshire ; Mardale, VVestmore- 



