OF GREAT BRITAIN. 173 



forma diffracto-areolata, Leight. albido-cirierascent, coarsely 

 diffracto-areolate, areola more or less irregularly convex ; apothecia 

 subsessile, concave, margin prominent. 



Exs :— Schaer. 620. 



Geog. Distmb : — Switzerland, Hungary, Sweden, Italy . 



Bot. Peov :— 26. 



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



forma verrucoso-areolata, Leight. albido or sublutescenti-cin- 



ereous, verrucoso-areolate, areola small, convex, verrucose ; apothecia 



sessile, margin prominent. 



Exs :— Zw. 4. Kabh. 921. Richardson. 124. 



Geog. Distrib : — Arctic America, Hungary, Norway, Sweden, Switzerland, 

 Germany, Lapland. 

 Bot. Peov :— 31. 

 Channel Islands : — Noirmont ! Jersey. Mr. Larbalestier. 



forma lepidota, Leight. cinereo-fuscescent, squamoso-areolate, 

 scnianice convex or rugose ; apothecia innate, margined. 



Stn :— Grevillea 3. p. 116. 



Bot. Prov:-7...31. 



Wales : — Barmouth ! Pwlhelli ! Moel-y-gest ! 



Channel Islands : — Beauport ! Jersey. Mr. Larbalestier. 



12. L. Myrini, (Fr.) cinerascent or lutescent, tartareous, rimoso- 

 areolate, contiguous, areolae smooth or verruculoso-rugose, hypo- 

 thallus black (thallus K yellow then red, medulla I blue) ; apo- 

 thecia somewhat plane, black, naked, or slightly pruinose ; hypo- 

 thecium colourless; spores 8, colourless, ellipsoid, or globoso- 

 ellipsoid, simple ; paraphyses cohserent ; gelatina hymenea blue 

 with iodine ; spermatia subcylindrical. 



On sub-alpine rocks. 



Syn -.—Parmelia, Fr. S. V. Sc. 108. (1845.) Lecanora, Nyl. Flora 1869. p. 

 413. Th. M. Fries Scand. 283. Leight. in Grevillea,. 1. 125. 

 Exs :— Fellm. 121. 

 Geog. Distklb : — Lapland, Sweden. 

 Wales : — Barmouth ! Rev. T, Salwey. 



13. L. prcepostera, (Nyl.) white, thin, nearly smooth, areolato- 

 rimose, sub-fimbriated and darkly limited at the circumference (K 

 yellow then cinnabarine-reddish) ; apothecia blackish, opake, 

 glauco-suffused or subdenudate, moderate, thalline margin rugulose 

 or subcrenate ; spores 8, colourless, ellipsoid, simple ; paraphyses 

 slender ; epithecium yellowish ; gelatina hymenea and especially 

 the thecse. bluish with iodine. 



On maritime basaltic rocks, rare. 1872. 



Syn :— Nyl. in Flora 1873. p. 19. Crombie in Grevillea 1. 141. 



Bot. Peov:— 31. 



Channel Islands : — Jersey. Mr. Larbalestier. (1872.) 



Not Unlike some state of L. subfusca var. atrynea, but distinct by the 

 smaller spores, chemical reaction and other characters. Spores .009—14 mm. 

 long, .005—6 mm. broad. 



14. L, oculata, (Dicks.) white or albo-cinerascent, dactylino- 

 papillate, glabrous ; apothecia at first innate in the apices of the 

 papilla, ultimately expanded, sub-concave, black, thalline margin 

 thick, inflexed, entire ; spores 8, colourless, ellipsoid, simple ; 

 thallus K ferruginous-red. 



