76 COLLEMACEL. [LEPTOGIUN. 
lands, Scotland.—B. M. : Inverary and Appin, Argyleshire ; Glen Lochay, 
Glen Lyon, Fortingall, Loch Earn, and Craighall, Perthshire; Clova, 
Forfarshire ; Lochaber, Inverness-shire. 
18. L. Hildenbrandii Ny]. 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 rhizinw. 
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. Soe. i. (1791) p. 84. 
Distinguished from L. saturninum, to which itis closely allied, by being 
more monophyllous, usually smaller, and especially by being fibrilloso- 
rhizinose 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 N. England and the S. Grampians of Scotland. 
—B. M.: Teesdale, Durham. Glenample and Craighall, Perthshire ; 
Clova, Forfarshire. 
19. L. Burgessii Mont. Pl. 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 Burgessit Gray, 
Nat. Arr. i. p. 399; Mudd, 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 Burgessit Lightf. Fl. Scot. ii. (1777) p. 827, t. 26; 
Huds. Fl. Angl. ed. 2, p. 538; Eng. Bot. t. 800 ; With. Arr. ed. 3, 
iv. p. 57.— Brit. Evs.: Cromb. n. 6; Dicks. Hort. Sic. n. 24. 
This is the largest of the British Col/emei, and may at once be recognized 
by the parmelioid thallus and the foliaceous 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 
mae plane, and blackish, with the thalline margin more or less oblite- 
rated. 
Hab. 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, 8. Devon; Nannau, near Dolgelly, Cwm-Bychan and 
Barmouth, Merionethshire ; Hafod, Cardiganshire; Mardale, Westmore- 
