OF GREAT BRITAIN. 91 



ceous or glauco-whitish, terminal or subterminal ; receptacle smooth 

 or rugulose, sessile on a turgid branch, or appendieulate ; spores 

 oblong or fusiformi-oblong, straight or obsoletely curved. 

 On old thorn bushes, rare. 1876. 



Syn:— Hook, and Tayl. in Lond. Journ. Bot. 3. 655. (1854) Nyl. Mon. 

 Kamal. 65. 



Geog. Distbib : — Australia, New Zealand, S. America, Nova Granada, 

 Africa. 



Bot. Prov :— 26. 



Ireland : — Killery Bay, co. Galway. Mr. Larbaleslier. (1876). 



"Spores .009— .015 mm. long, .004—7 mm. broad." (Nyl.) 



Tribe X. CETRARIEI. 

 Thallus compressed, rarely terete, variously fruticulose, or 

 narrower, or frondose, membranaceous, dilatate or lobate, epi- 

 thallus somewhat shining, internally filled with a white woolly 

 medulla. Apothecia lecanorine, marginal. Spores 8, small, oolour- 

 less, simple. Paraphyses indistinot. Spermogonia marginal, in 

 setuliform apiouli, or black papillse. 



I. CETRARIA. Ach. pr. p. Nyl. 



Thallus spadiceous or spadiceo-pallescent, rigescent, erect or 

 ascending, laciniose, rarely fistulose, somewhat shining. Apothecia 

 dull or bright brown. Spermatia cylindrical. 



1. G. islandica, (L.) pale or pale chesnut-brown or fuscescent, 

 lacinice broad, variously divided, frequently subcanaliculate, margins 

 spinuloso-ciliated, with impressed white soredia on the back ; apothecia 

 brown, large, adnate to the upper surface of the apices of the lacmice, 

 receptacle entire or crenulate. 



On the ground in sub-alpine places, rare. 1794. 



F. 1. platyna, Ach. lacinise platyphyllous, margins spinuloso- 

 ciliated. 



Syn :— Ach. Syn. 229. (1817). Nyl. Scand. 79. Syn. 208. Mudd Man. 77. 



Fig : — E. Bot. 133. Nyl. Syn. t. 8. f. 32. 



Exs :— Schaa-. 22. Mudd 51. Leight. 42. Anzi It. S. 48. Mass. 102. Fellm. 

 58. Hepp 169. 



Geog. Distrib : — Frigid and Alpine Europe, N. America, Himalaya. 



Bot. Pbov:— 4...7, 8.. .10, 11.. .13, 14, 15...18, 19, 20. 



England : — Durham, Bev. J. Barriman. Murton Craigs ; Belford ; Lam- 

 berton Moor, Berwick-on-Tweed. Dr. G. Johnston. Flarendale and on Seamer 

 Moor, near Scarborough, Yorkshire. Mr. Baker. Terrington ; Stockton ; Ears- 

 ley Moors, Yorkshire. Mr. Teesdale. (1794). Ingleborough ; Gregareth, York- 

 shire. Dr. Windsor. Gateshead, Whickham, and Muggleswick Fells ; Teesdale 

 and Weardale, Durham ; Cheviot ; Hedgehope ; Simonside ; Wallington Moors, 

 Northumberland. Mr. Winch. King's Lynn ! Norfolk. Mr. Plowright. Market 

 Rasen ! Lincolnshire. 'Dr. F. A. Lees. 



Scotland: — Pentland Hills, near Edinburgh; Ben Lomond. Sir J. E. 

 Smith. Ben-na-Boord, Aberdeenshire ; King's Park ; Corstorphine ; Dalmahoy. 

 Dr. Greville. Morne near Castleton, Braemar. Prof. Graham. Sidlaw Hills ; 

 Clova Mountains ! Forfarshire. Mr. W. Gardiner. Long Island. Prof. Balfour. 

 Hartfell, Moffat. Dr. Nichol. Morchone, Braemar. Mr. Croatt. Ben Macdhui ! 

 Braemar. Mr. Baker. Loch-na-Garr ! Bev. T. B. Bell. Muirhall, Perth. Dr. 

 Lindsay. Grampians. Bev. J. M. Grombie. 



Ireland : — Summit of Mangerton. Dr. Taylor. Devil's Ladder, Carrantuel, 

 Mc GiUicuddy'B Beeks. Mr. Hardy. 



