318 LICHENACEI. [PHTSCIA. 



laud ; rare in the Channel Islands and N. "Wales ; not seen from Ireland. 

 — B. M. : Island of Guernsey. Acle, Norfolk; Walthamstow, Essex; 

 Richmond House, Surrey ; Withiel and near Penzance, Cornwall ; near 

 Oxford ; Twycross, Leicestershire ; near Harboro' Ma^na, Warwick- 

 shire ; Buxton, Derbyshire ; near Oswestry, Shropsliire ; Barmouth, 

 Merionethshire ; A_\-ton, Cleveland, Yorkshire ; Teesdale, Durham ; near 

 Kendal, Westmoreland ; near Hexham, Northumberland. New Gallo- 

 way, Kirkcudbrightshire ; near Edinburgh ; Kirktield, Lanarkshire ; 

 Appin, Argyleshire ; Dunblane, Perthshire; Craig TuUoch, Blair Athole, 

 Pertlishii'e ; Crathie, Braemar, Aberdeenshire. 



Form teretiuscula Nyl. Lich. f^cand. (1861) p. 112. — Laciuise 

 narrower, more discrete, somewhat convex ; otherwise as above. — 

 Farmdia casta (3. teretii'Mula Acli. Lich. Univ. (1810) p. -179. 



Dift'ers from the type only in the minor characters of the laciniae, and 

 intermediate states are not wanting. The British specimens are sterile. 



Hab. On rocks in maritime and mountainous districts. — Distr. Seen 

 only from W. England and S.W. Ireland. — B. M. : Penzance, Cornwall ; 

 Malvern, Worcestershire ; Dunkerron, co. Kerry. 



21. P. obscura Xyl. Act. Soc. Linn. Borfl. ser. 3, i. (1856) p. 309. 

 — ThaUiis orbiculari-stellate, closely appressed and adnate, dark or 

 greyish-brown ; beneath black-tibrillosc ; laciuia3 narrow, plane or 



slightly convex (K~, CaCl~). Apothecia sessile, small, blackish- 

 brown, naked, the margin entire ; spores ellipsoideo-obloug, 0,015— 

 25 mm. long, 0,009-12 mm. thick. — Cromb. Lich. lirit. p. 39; 

 Leight. Lich. Fl. p. 148 pro parte, ed. 3, p. 136 pro parte. — Borrera 

 obscura Mudd, Man. p. 109 pro jmrte. Lichm obscurKS Ehrh. PI. 

 Crypt. (1785) n. 177. Parmeha njdoselis Acb., Gray, Nat. Arr, i. 

 p. 444 pro parte ; Sm. Eng. El. v. p. 202 pro parte. Lichen cijch- 

 stlis Eng. Bet. t. 1942.— Brit. Exs. : Larb. Lich. Hb. n. 252. 



In its typical condition, which has seldom been rightly described, the 

 thallus is entirely esorediate, with the margins of the laciniie ehbrillose. 

 The form chloantha (Ach. Syn. p. -17), with '• pale-gi'eyish thallus and 

 laciuise lacerato-dentate at the margins," has not yet occurred with us, 

 though recorded by Leighton, I. c, as British. In our specimens the 

 apothecia are fairly numerous. The spermogones are more frequent, 

 with spermatia oblong, 0,003 mm. long, about 0,001 mm. thick. 



Hah. On the trunks of trees in upland situations. — Distr. Seen only 

 from a verv few localitit- s in England and the S. Grampians, Scotland ; no 

 doubt frequent but overlooked. — B. M. : Brockenhurst, New Forest, 

 Hants ; near Cambridge ; near Ledbury, Herefordshire. Einlarig, Killin, 

 Perthshire. 



22. P. lithotea Nyl. Flora, 1877, p. 354. — Thallus orbicular, 

 appressed, narrowly laciniate, glaucous- or dark-brown, furfuraceo- 

 or granuloso-sorcdiate ; beneath black-fibrillosc ; lacinia3 ])lane, 

 closely imbricate, subciliate at the margins (K~, CaCl"). Apo- 

 thecia central, blackish ; spores as in the preceding species or slightly 



