52 C0LLE3IACEI. [COLLEMA. 



Huds. Fl. Angl. ed. 2 (1778), p. 534; With. Mr. ed. 3, iv. p. 35 ; 

 Eng, Bot. t. 1924, LicJienoides gelatinosum fuscum, Jacohcece niari- 

 tim<T divisirra Dill. Muse. 140, t. 19. f. 25. 



This differs from the type in the form of the lacinise, the situation of 

 the apothecia, and their entire margin. The thallus also is not so dark 

 when growing, and the apothecia are more scattered, and concave when 

 young. 



Hab. On calcareous rocks and walls in maritime and upland ti-acts. — 

 Bistr. Probably general, though as yet seen only from W. EnLdand, N. 

 Wales, the W. Highlands, Scotland, and S.'li-eland.— B. 51. : Near 

 Torquay, Devonshire ; Pentregaer, near Oswestry, Shropshire ; near 

 Wrexham, Denbighshu'e ; near Settle, Yorkshire ; Teesdale, Durham ; 

 near Kendal, Westmoreland ; Lamplugh, Cumberland. Appin, Argyle- 

 shire; Gairloch, Ross-shire. Middleton, co. Cork; Dunkerron, 'co. 

 Kerry ; Loughcooter, co. Galway. 



Form 2. jacoTjseifolinm Ach. Lich. Univ. (1810) p. 637. — Thallus 

 deepl)' laciniate ; laciniae lacero-pinnatifid, radiate, narrow, canali- 

 culate, the margins crisp. Apothecia marginal, the thalline margin 

 subentire. — Miidd, Man. p. 37 ; Cromb. Journ. Bot. 1874, p. 334 ; 

 Leight. Lich. Fl, ed. 3, p. 21. — Lichen jacobacefoUus Schrank, Fl. 

 Bay. (1789) ii. p. o'30.— Brit. Exs. : Larb. Csesar, n, 2, 



Very closely allied to the preceding, diflPering in the more deeply 

 divided, radiating, narrower laeiniae, and the subentire thalline margin of 

 the apothecia. The fructification is ver}' rarely present in the British 

 specimens. 



Hah. On calcareous rocks in maritime distiicts. — Disfr. Local and rare, 

 in the Channel Islands and S. England ; it no doubt occurs elsewhere. — 

 B. M. : Quenvais, Island of Jersey. Isle of Wight. 



Form 3. gyrosum Ach. Lich. Univ. (1810) p, 638.— Thallus 

 gyroso-complicate : lacinia? approximate, subequal, crisp and crenate 

 at the margins. Apothecia scattered, marginal, the thalline margin 

 entire or slightly granulate. — Cromb. Journ. Bot. 1874, p, 334 ; 

 Leight, Lich, Fl, ed. 3, p. 21. — Lichen gyrosus Ach. Prodr. (1798) 

 p, 135, 



This form (identified from a specimen of Acharius in Linn. Soc.) is 

 not unlike C. cristatv.m, and differs from the type in the gyrose laciniae, 

 Avhich are plicate, densely approximate, and nearly even at the margins. 

 The apothecia are scattered, but are Aery rare in a fully developed con- 

 dition. 



Hab. On the ground among calcareous rocks in upland situations. — 

 Distr. Very local and scarce, in Central England and among tlie Central 

 (irampians, Scotland. — B. M. : Near Buxton, Derbyshire. Craig Tul- 

 loch, Blair Athole, Perthshire. 



Subsp. C. hjrpergenum Nyl. Flora, 1870, p. 232. — Thallus lacero- 

 laciniate ; lacinite somewhat narrow and short, the margins crisp and 

 crenate. Apothecia marginal or submarginal. approximate, the 

 thalline margin entire : spores 0,026-36 mm. long, (i,()10-16 mm. 

 thick. — Qrouib. Ureviliea, v. j). 25; Leight. Lich. Fl. cd. 3, p. 21. 



