COLLEMODIUM.] COLLEMET. 59 



3. C. fragOe Nyl. ex Cromb. Grevillea, xv. (1886) p. 12. 

 Thallus small, rosulate, laciniato-lobed, dark olive-green or olive- 

 brown ; lobes convex, granuloso-unequal, radiate and crenate at the 

 circumference. Apothecia minute, urceolate, at lengtb somewhat 

 plane, dark-brown, the thalline margin entire, thickish ; spores 

 ovoid, variously divided, about 0,029 mm. long, 0,013 mm. thick. 

 Leptogium fragile Nyl. Mem. Soc. Cherb. v. (1857) p. 333 ; Cromb. 

 Lich. Brit. p. 7 ; Leight. Lich. Fl. p. 36, ed. 3, p. 27. Collema 

 fragile Tayl. in Mack. Fl. Hib. ii. (1836) p. 109 ; Mudd, Man. 

 p. 38. 



The thallus is almost stellato-laciniate, with the lacinise irregularly 

 arranged and variously divided ; the gonimic granules are rarely mouili- 

 forni. With its radiating lacinite, it somewhat resembles young states of 

 Collema multipartitum. In the British specimens the apothecia are only 

 sparingly present. 



Hob. On calcareous rocks in maritime and upland districts. Distr. 

 Only sparingly in S. and N. England and in S.W. Ireland. B. M. : 

 Anstey's Cove, Torquay, S. Devon ; Barrowmouth, Cumberland. Dun- 

 kerron, co. Kerry. 



4. C. plicatile Nyl. ex Lamy, Bull. Soc. Bot. Fr. t. xxx. (1883) 

 p. 337. Thallus somewhat small, laciniato-lobed, olive- or leaden- 

 brown ; lobes thickish, slightly rugulose, erect or ascending in the 

 centre, plicate towards the circumference, often crisp at the margins, 

 more or less granuloso-furfuraceous. Apothecia small or nearly 

 moderate, somewhat concave or plane, reddish-brown, the thalline 

 margin thick, entire ; spores ovoid, 3-septate, and irregularly murali- 

 locular, 0,018-30 mm. long, 0,008-16 mm. thick. Cromb. Gre- 

 villea, xv. p. 12. Leptogium plicatile Nyl., Cromb. Journ. Bot. 

 1874, p. 336 ; Leight. Lich. Fl. ed. 3, p. 30. Collema plicatile Sm. 

 Eng. Fl. v. p. 209 ; Mudd, Man. p. 38 ; Cromb. Lich. Brit. p. 5 ; 

 Leight. Lich. Fl. p. 22. Enchylium plicatile Gray, Nat. Arr. i. 

 p. 397. Lichen plicatilis Ach. N. Act. Stock, xvi. (1795) p. 11, 

 t. 1. f. 2. Lichenoides gelatinosum atro-virens, auriculatum et gra- 

 nosum Dill. Muse. 140, t. 19. f. 24 *-v.Brit.Exs.'. Cromb. n. 106. 



This, as observed by Nylander (Leptoyium jirmum Lich. Scand. p. 34), 

 resembles L. sinuatum, but the thallus is thicker, very thinly or incon- 

 spicuously cellulari-corticate. The apothecia, which are scattered, are 

 not very numerous in our British specimens. 



Hob. On calcareous rocks and walls, rarely on trunks of trees, in 

 maritime and upland districts. Distr. Local and scarce in S. and "W. 

 England, rare in the W. Highlands of Scotland and in S.W. Ireland. 

 B. M. : Near Maidstone, Kent ; Shoreham, Beeding, and Lewes, Sussex ; 

 Babhicombe and Plymouth, S. Devon ; Mendip Hills, Somersetshire ; 

 near Cirencester, Gloucestershire. Near Appm House, Argyleshire. 

 Ardtully, co. Kerry. 



Form minus Cromb. Grevillea, xv. (1886) p. 12. Thallus smaller, 

 laciniac narrower, rather longer, when dry somewhat angulose ; 



