LEPTOGIFM.j COLLEMEI. 71 



laciniate. Apothecia small, somewhat rare. Cromb. Journ. Linn. 

 Soc., Bot. xvii. p. 567. Leptogium lacerurii j3. pulvinatwn Mudd, 

 Man. p. 47 ; Cromb. Lich. Brit. p. 8; Leight. Lich. Fl. p. 33, ed. 3, 

 p. 28. Collema pulvinatwn Hoffm. Deutsch. Fl. (1795) p. 104. 

 Lichen tremeUoidts y Lightf. Fl. Scot. ii. p. 842; "With. Arr. ed. 3, 

 iv. p. 73. LicJienoides tenve crispum, foliis exigvis sun-tctis Dill. 

 Muse. 146, t. 19. f. 34 A, et LicJienoides tenue crispwm et veluti 

 aculeatum p. 146, t. 19. f. 35. Brit. Exs. : Larb. Caesar, n. 55 ; 

 Lich. Hb. ii. 241. 



This, which might almost bo regarded as a distinct species, is dis- 

 tinguished by the minute, crowded, denticulate laciniaa ; it forms pulvi- 

 nate tufts which are either determinate or somewhat spreading. The 

 apothecia, which are seldom seen, are chiefly central. 



Hub. On rocks and old walls, occasionally on the ground, among 

 mosses in upland and subalpine tracts. Distr. Frequent in the Channel 

 Islands, Great Britain and Ireland, usually plentiful where it occurs. 

 15. M. : Queuvais, Island of Jersey. Cromer, Norfolk; Epping Forest, 

 Kssex ; Shiere, Surrey ; Bonchurch and Luccombe, Isle of Wight ; near 

 Plymouth, Devonshire ; Batliampton Downs, Somersetshire ; Chalford 

 and near Cirencester, Gloucestershire ; Malvern Hills, Broadwas, and 

 Alfric, Worcestershire ; Twycross, Leicestershire ; Aberdovey, Merioneth- 

 shire; Clee Hills, Shropshire; Kildale, Cleveland, Yorkshire; Stavely, 

 Westmoreland; Alston, Cumberland. Appin, Argyleshire ; Killin and 

 Ben Lawers, Perthshire ; S. of Fort William, Inverness-shire. Inchi- 

 gaggin, co. Cork ; near Anragh, co. Antrim. 



Subsp. 2. L. lophaeum Nyl. ex Cromb. Grevillea, XT. (1886) p. 13. 

 Thallus very small, pulvinate, greenish-black ; lobes minute, very 

 much crowded, ciliato-dissect or ramoso-fimbriate, the brabble 1 . 

 "- 1 ' iscia unknown. Leptogium laccrumv&r.lophceum 

 Cromb. Lich. Brit. p. 8; Leight. Lich. Fl. p. 34, ed. 3/p. 29. 

 Parmelia scotina y. lophcea Ach. Meth. (1803) p. 238. 



Probably a distinct species, differing from the preceding subspecies in 

 the cylindrical branches and smaller thallus, which is composed of minute, 

 irregularly laciniate and ramulose denticulate lobes. With us, as else- 

 where, it is sterile. 



Hab. On decaying stumps of old trees in maritime tracts. Distr. 

 - *- -- \. Wales and in the W. Highlands of f - 1 ' 

 rionethshire. Barcaldine, Argyleshire. 



Found but sparingly in N. Wales and in the W. Highlands of Scotland. 

 B. M. : Barmouth, Merior 



13. L. scotinum Fr. Sum. Veg. (1846) p. 122; Nyl. Syn. i. 

 (1858) p. 123. Thallus laciniato-lobed, plicate, reticulato-rugulose, 

 dark glaucous-green or brownish lead-coloured ; lobes rounded, some- 

 what crowded, subcrect and entire at the margins. Apothecia small, 

 concave, brownish-red, the margin smooth, elevated ; spores ovoid, 

 irregularly murali-locular, 0,024-41 mm. long, 0,008-0,016 mm, 

 thick. Cromb. Lich. Brit, p., 8, pro parte. Leptogium sinuatum 

 Mudd, Man. p. 47, pro parte ; Leight. Lich. Fl. p. 37, pro parte, ed. 3, 

 p. 39, pro parte. Lichen scotinus Ach. Prodr. (1798) p. 128. Brit. 

 Exs. : Mudd, n. <!, pro parte ; Cromb. n. 109, pro parte. 



