304 L1CHENACEI. [PHYSCIA. 



0,035-63 mm. long, 0,018-25 mm. thick. Cromb. Lich. Brit. p. 38 ; 

 Leight. Lich. Fl. p. 149, ed, 3, p. 138. Borrera leucomela Gray, 

 Nat. Arr. i. p. 434 ; Sm. Eng. Fl. v. p. 223 ; Mudd, Man. p. 104. 

 Lichen leucomelas Linn. Sp. PI. ed. 3 (1764) p. 1613 ; Eng. Bot. 

 t. 2548. Lichenoides anyustifolium planum, crinibus nigris Dill. 

 Muse. 156, t. 2. f. 50. Brit. Exs. : Leight. n. 166 ; Larb. Ctesar. 

 n. 69 ; Cromb. n. 150. 



Closely allied to P. ciliaris, but well distinguished by the simpler 

 whiter lacinise and by the constantly dentate-coronate margin of the 

 apothecia. The marginal cilia, which are usually short in our specimens, 

 are generally blackish or partly brownish, according to exposure. The 

 apothecia do not occur in this country, and the spermogones, which are 

 similar to those of the preceding, are but rarely present. 



Hab. On the ground among mosses and short grass, rarely on mossy 

 trunks of trees, in maritime districts. Distr. Confined to the Channel 

 Islands and S. coasts of England and Ireland. B. M. : Quenvais and St. 

 Owen's Bay, Island of Jersey ; Islands of Sark and Alderney. St. Leonard's 

 Forest, Sussex ; Babbicombe and Bolt Head, S. Devon ; The Lizard and 

 Kynance Cove, Cornwall ; Bryer and Trescoe Islands, Scilly. Ballycotton 

 and Cape Clear Island, co. Cork. 



9. P. speciosa Nyl. Act. Soc. Linn. Bord. ser. 3, i. (1856) p. 307. 

 Thallus appressed, stellato-laciniate, csesio- or greyish-white, 

 greenish-white when wet ; beneath whitish, with whitish or sordid- 

 whitish fibrillose rhizinae ; lacinise narrow, multih'd, plane subimbri- 

 cate, with whitish or sordid marginal cilia, the apices dilated, obtuse, 

 usually somewhat ascending and sorediiferous (K^yellow, CaCl~). 



Apothecia sessile, moderate, brown, the margin incurved, entire or at 

 length crenulate ; spores 8noe, oblong, 1-septate, colourless, 0,025- 

 36 mm. long, 0,012-19 mm. thick. Cromb. Lich. Brit. p. 38 ; 

 Leight. Lich. Fl. p. 151, ed. 3, p. 138. Borrera speciosa Mudd, Man. 

 p. 107. Parmelia speciosa Gray, Nat. Arr. i. p. 442 ; Hook. Fl. Scot. 

 ii. p. 55 ; Sm. Eng. Fl. v. p. 201 ; Tayl. in Mack. Fl. Hib. ii. p. 149 

 proparte. Lichen speciosus Wulf. in Jacq. Coll. iii. (1789) p. 119 ; 

 Eng. Bot. t. 1979 (upper fig.). 



Muscicolous states, in which the thallus is more diffuse and the laciniae 

 narrower and more discrete, have somewhat the appearance of P. leuco- 

 mela, while corticolous and saxicolous states, in which they are closer and 

 more imbricate, are somewhat similar to P. aipolia. With us it never 

 occurs in a typical condition, but only sorediiferous, as elsewhere in 

 Europe. In the more imbricate states the marginal cilia are but very 

 sparingly present or entirely absent ; and when growing in more exposed 

 situations these, as well as the rhizinse, become blackish. Specimens 

 with the latter character are referred by Leighton (Lich. Fl. iii. p. 139) 

 to var. kypokuca (Ach.). The apothecia have not been detected in Great 

 Britain ; but the spermogones occasionally occur in S. W. England. 



Hab. On mosses, rocks, and trees, chiefly in maritime districts. Distr. 

 Local and scarce in the Channel Islands, in S. and W. England, the W. 

 Highlands of Scotland, and in S.W. and N.E. Ireland. B. M. : Ilozel, 

 Island of Jersey ; Islands of Alderney and Guernsey. St. Leonard's 

 Forest, Sussex; Bolt Head, Devonshire; The Lizard, Kyuauce Cove 



