76 COLLEMACEI. [LBPTOGITJM. 



lands. Scotland. B. M. : Tnverary and Appin, Argylesliire ; Glen Lochay, 

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

 Forfarshire ; Lochaber, Inverness-shire. 



18. L. Hildenbrandii Nyl. Syn. i. (1858) 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 rhizinao. 

 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. Collema Hildenbrandii Garov. Lich. It. (1837) n. 1. Li- 

 chen saturninus Sm. Trans. Linn. Soc. i. (1791) p. 84. 



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

 more monophyllous, usually smaller, and especially by being nbrilloso- 

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

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



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

 districts. Distr. Onlv in N. 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-brown, 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, 

 Nat. Arr. i. p. 399 ; Mudd, Man. p. 45. Collegia Burgessii Hook. 

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

 ii. p. 110. Liclien 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. Exs. : Cromb. n. 6 ; Dicks. Hort. Sic. n. 24. 



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

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

 thecia. Where the p_lant 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 

 nearly plane, and blackish, with the thalline margin more or less oblite- 

 rated. 



Hob. On the trunks of old trees near water (lakes and rivers), rarely 

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

 usually common, in the mountainous tracts of W. Britain ; very abundant 

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

 Bridge and Lidford, S. Devon; Nannau,near Dolgelly, Cwm-Bychan and 

 Barinouth, Merionethshire ; llafod, Cardiganshire ; Mardale, Westmore- 



