304 LICHEXACEI. [pnYSCIA. 



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 leucomeJa (iray, 

 IS^at. Arr. i. p. 434; Sm. Eng. FL v. p. 223 ; Mudd, Man. p. 104. 

 Lichen Jeucoraelas Linn. 8p. PL ed. 3 (1764) p. 1613 ; Eng. Bot. 

 t. 2548. Liclienoides anr/iistifoUnm j:)?rt?i?<?H, crinihus nigris DilL 

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

 n. 69 ; Cromb. n. 150. 



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

 •whiter laciui;i3 aud by the constantly dentate-corouate margin of the 

 apotheeia. The marginal cilia, which are iL<ually short in oui' specimens, 

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

 apotheeia do not occur in this country, and the speiiuogones, which are 

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



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

 trunks of trees, in maritime districts. — Dii'tr. Contined to the Channel 

 Islands and S. coasts of England and Ireland. — B. M. : Queuvais 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. BaUycotton 

 and Cape Clear Island, co. Cork. 



9. P. speciosa Xyl. Act. See. 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 rhizina; ; lacinige narrow, multifid, plane subimbri- 

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



usually somewhat ascending and sorediiferous (Kj^j'ellow, CaCl~). 



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

 length crenulate ; spores Snaj, 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 sj)eciosa Mudd, Man. 

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

 ii. p. 55 ; Sm. Eng. Fl. v. p. 20l ; Tayl. in Mack. Fl. Hib. ii. p. 149 

 pro parte. Lichen sjicciosus Wulf. in Jacq. Coll. iii. (1789) p. 119 ; 

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



Muscicolous states, in which the thallus is more diffuse aud the laciuise 

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

 mela, while corticolous aud 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 rhizinte, become blackish. Specimens 

 with thi;" latter character are referred by Leighton (Lich. Fl. iii. p. 139) 

 to var. hi/poh'uca (.Vch.). The apotheeia have not been detected in Great 

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



Hah. On mo.sses, 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 X.E. Ireland. — B. M.: Kozel, 

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

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



