OF GREAT BRITAIN, 119 



Scotland : — Larig Crue under Cairngorm. Mr. Borrer. (1808). Marr Forest. 

 Mr, O. Don. Northern Forest of the Highlands ; Kinnordy, Forfarshire. Sir 

 W. J. Hooker. Cairngorm. Messrs. Borrer and Hooker. Glen Derry. Rev. J. M. 

 Orombie. 



Walks : — Cwmbychan near Barmouth, and Powis Castle Park. Rev. T. 



" Spores .006 -11 mm. long, .0025— .0035 mm. broad." (Nyl.) 



7. P. cetrarioides, Del. glauco-albescent, subcoriaceous, orbicular, 

 lobes rotundate, margin rotundo-crenate, elevated, crisped; medulla 

 K — — ,• apothecia badio-rufous, margin entire ; spores 8, colour- 

 less, ellipsoid, simple. 



On trees and stones, frequent. 1869. 



Syn : — P. perlata var. cetrarioides, Delise in Duby Bot. Gall. 601. (1829). 

 Nyl. in Flora 1869. p. 290. Crombie En. 34. 



Exs :-Arn. 582. Hepp. 578. 



Geoq. Disteib : — Europe. 



Box. Prov :— 2.. .5. ..7.. .13.. .15. ..31. 



England :— New Forest. Rev. J. M. Orombie, Cotteswold Hills. Mr. W. 

 Joshua. 



Scotland : — Loch Lomond ! Dr. Stwton. New Galloway ! Mr. W. Andrew. 



Wales :— Dolgelley ! Barmouth ! Dr. Holl. (1869). Capel Curig ! Drwsynant ! 



Channel Islands : — Near Bozel, Jersey ! Mr. Larlalestier. 



8. P. hyperopta, (Ach.) albido-cinerous, membranaceous, closely 

 adherent, laciniato-lobate, central lubes somewhat convex, rugoso- 

 plicate ; soredia roundish, elevated, albo-pulverulent ; lobes of the 

 circumference linear, plane, naked ; medulla K — C — ; apothecia 

 scattered, brown and shining, margin crenulate ; spores 8, colour- 

 less, linear-oblong, simple, curved, lumdate or falcate, minute. 



On pine trees, rare. 1808. 



Stn :— Aeh. Syn. 208. Korb. Syst. L. Germ. 73. 



Fig :— Nyl. Scand. 1. 1. f. 1. E. B. Suppl. 2796. (white figures). 



Exs — Anzi Langob. 51. Fellm. 85. 



Geog. Distbib :— Sweden, Austria, Italy, France, East Lapland. 



Bot. Prov : — 15 



Scotland : — Forest of Rothiemurchus. Mr. Borrer. (1808). Glen Dee, Brae- 

 mar. Rev. J. M. GromMe. 



Well distinguished from P. aleurites, with which it has been heretofore con- 

 founded, by the round separated soredia, and the curved spores, and different 

 reaction, the entire central portion of the thallus in P. aleurites being sorediate. 



" Spores .011—12 mm. long, .003—4 mm. broad." (Nyl.) 



9. P. reddendo, Stirt., precisely similar externally both in colour 

 and albo-soredioid points to P. Borreri, Turn, but the medulla 

 K — G — ; under surface black, spadiceous at the circumference, 

 rugulose ; rhizinse black, nigricant, or even sometimes pallid. 



On rocks and trees, probably not uncommon but overlooked, 



sterile. 1871. 



Syn : -Stirton in Scottish Naturalist, July, 1878. p. 298. 

 Bot. Pbov :— 7...13. 



Scotland : — Near New Galloway ! Mr. J. M. Andrew. 

 Wales :— Glyn, near Capel Curig ! (1871). 



B. medulla of thallus K yellow C — . 



10. P. perlata, (L.) albo-glaucescent or whitish, dilated, lobate, 

 lobes rotundate, subimbricate, often albo-sorediate on the margins, 

 under surface fuscous-black or black, and pale towards margins ; 

 K + C + , medulla K yellow C — ; apothecia badio-rufous, margin 

 entire ; spores 8, colourless, ellipsoid, simple. 



