OF GREAT BRITAIN. 165 



and inciso-crenate at the apices; apothecia brownish-Mack, sessile, 

 casio-pruinose, thick margin eventually nearly obliterated; spores 

 8, colourless, ellipsoid, 1-septate. (K — C — ). 

 On limestone rocks, rare. 1875. 



Syn :— Mass. Mem. 47. 1855. 



Fig :— Mass. Mem. t. 8. f. 46. 



Exs : — Mass. 141. Anzi Langob. 447. 



Geog. Distrib: — Italy, 



Bot. Pbov :— 5. 



England :— Sherbourne ! Gloucestershire. Mr. Joshua. 



"Spores .0100 mm. long, .00336 mm. broad." (Mass.) 



11. P. chalybaium, (Duf.) plumbeo-albicant or cinereo-albescent, 

 adnate, smooth, diffracto-areolate, obsoletely lineari-radiate at the 

 circumference, hypothallus blackish, slightly extended beyond the 

 thallus ; apothecia innate or immersed, black, plane, more or less 

 pruinose, thalline margin entire, depressed ; spores 8, colourless, 

 elliptico-oblong, polari-bilocular. 



On limestone rocks, rare. 1861. 



Syn :— Dufour in Fries L. Eur. 125. (1831.) Nyl. Scand. 138. Mudd Man. 134. 



Eig :— Hepp Sporen t. 22. f. 204. 



Exs :— Hepp 204. Schasr. 566. Zw. 226. Anzi Langob. 35. 



Geog. Distkib : — Europe. 



Bot. Pbov:— 1... 7.. .10.. .15. 



England : — Near Renhill, Yorkshire. Mr. Baker. Babbiecomb, Devonshire 

 Atlm. Jones. Yatton, Somerset. Mr. Joshua. Llanymynech Hill ! Shropshire. 



Scotland : — Craig Tulloch ! Blair Athole. Rev. J. M. Grombie. 

 . Wales : — Eglwyseg Rooks ! near Llangollen, Glyn ! near Capel Curig. 



" Spores .0025 to .00275 in. long, by .0015 in. broad." (Mudd.) "Spores 

 .011—15 mm. long, .006—8 mm. broad." {Nyl) Spores .011 mm. long, .0045 

 mm. broad. 



12. P. variabile, (Pers,) fusco-cinerous, adnate, diffracto-areo- 

 late, hypothallus nigricant, predominant ; apothecia prominent, 

 black, plane, more or less pruinose, thalline margin thin, lohite, 

 sub-crenulate ; spores 8, colourless, elliptico-oblong, polari-bi- 

 locular. 



On rocks, rare. 



Stn : -Pers. in Ust. Ann. Bot. 7. 26. (1794.) Ach. 165. Nyl. Scand. 138. 



Fig :— Hepp Sporen t. 9. f. 74. 



Exs :— Anzi It. S. 143. Rabh. 794. Hepp 74. 



Geog. Disteib : — Scandinavia, Italy. 



Bot. Pbov :-1...5...8...15...26. 



England : — Buxton, Derbyshire ! Dr. Soil. Grove Lane, Cirencester. Mr. 

 W. Joshua. Bath ! Mr. C. E. Broome. Llanymynech Hill ! Shropshire. 



Scotland : — Craig Culliach. Rev. J. M. Grombie. 



Ireland : — Dawros River ! co. Galway. Mr. Larbalestier. 



" Spores .013— 16 mm. long, .007— .010 mm. broad," {Nyl.) Spores .015— 

 .017 mm. long, .007. mm. broad. 



13. P. Agardhianum, (Ach.) fumoso-cinereous, thin, effuse, 

 contiguous, smoothish, almost evanescent ; apothecia fuscous-black, 

 subinnale, convex, thallodal margin, thin, white, entire ; paraphyses 

 distinct ; spores 8, colourless, broadly oblong, polari-bilocular with 

 longitudinal tube. 



On limestone rocks and walls, frequent. 1871. 



Syn :-Ach. Syn. 152. (1814.) Nyl. Syn. 139. 

 ]?IX3 .■ — Hepp Sporen t. 46. f . 407. 

 Exs ;— Hepp 407. Arn. 50. Schser. 617. 



