52 COLLEMACEI. [COLLEMA. 



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

 Eng. Bot. t. 1924. Lichenoides gelatinosum fuscum, Jacobcece man- 

 timte divisura 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. 



Hub. On calcareous rocks and walls in maritime and upland tracts. 

 Distr. Probably general, though as yet seen only from W. Endand, N. 

 Wales, the W. Highlands, Scotland, and S. Ireland. B.M. : Near 

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

 Wrexham, Denbighshire ; near Settle, Yorkshire ; Teesdale, Durham ; 

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

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

 Kerry ; Loughcooter, co. Gal way. 



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

 deeply laciniate ; latinise lacero-pinnatifid, radiate, narrow, canali- 

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

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

 Leigh t. Lich. Fl. ed. 3, p. 21. Lichen jacobceafoliiis Schrank, Fl. 

 Bav. (1789) ii. p. 530 Brit. Exs. : Larb. Caesar, n. 2. 



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

 divided, radiating, narrower Iacinia3, and the subentire thalline margin of 

 the apothecia. The fructification is very rarely present in the British 

 specimens. 



Hab. On calcareous rocks in maritime districts. Distr. Local and rare, 

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

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



Form 3. gyrosnm Ach. Lich. Univ. (1810) p. 638. Thallus 

 gyroso-complicate ; laciniae 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. crtstatutn, and differs from the type in the gyrose laciniaj, 

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

 The apethecia are scattered, but are very rare in a fully developed con- 

 dition. 



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

 Dixlr. Very local and scarce, in Central England and among the Central 

 Grampians, Scotland. B. M. : Near Buxton, Derbyshire. Crate Tul- 

 loch, Blair Athole, Perthshire. 



Subsp. C. hypergenum Nyl. Flora, 1876, p. 232. Thallus lacero- 

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

 crenate. Apothecia marginal or submarginal, approximate, the 

 thalline margin entire ; spores 0,026-36 mm. long, 0,010-16 mm. 

 thick. Cromb. Grevillea, v. p. 25; Leight. Lich. Fl. ed. 3, p. 21. 



