OF GEEAT BRITAIN. 279 



107. Jj. areolata, Schser. pallido-fiavescent, crustaceous, thickish, 

 areolate or areolato-diffract, rimose, areolae plano-convex, smooth, 

 (K yellow G yellow) ; hypoikallus black ; apotheeia black, adnate to 

 the areola, naked, opake,. moderate, plano-convex, immarginate, 

 cinerascent within ; hypothecium colourless, very slightly rufeseent ; 

 spores 8, colourless, ellipsoid, simple ; paraphyses crowded but 

 distinct. 



On schistose rocks in mountain ranges, rare. 1864. 



Stn:— Schasr. Spicil. 127. (1828.) Enum. 114. Crombie En. 82. 



Geog. Distrib :— Switzerland. 



Bot. Prov :— 15. 



Scotland : — Summit of Ben Lawera ! Adm. Jones & Mr. Carroll. (1864.) 



The above description was drawn up from examination of the original speci- 

 men in Mr. Carroll s Herbarium, which was externally similar to L. aglcea and 

 L. Crombieii and internally differed in no respect. I cannot but regard it as a 

 state or variety of L. aglcea. Can our Scotch lichen be identical with Schserer's, 

 whioh is described as having the areolae of the thallus "candidae" and the 

 apotheeia " intus alba i" 



108. L. tessellata, (Flk.) creamy or whitish, tartareous, sub- 

 determinate, areolato-rimoso-diffract, areolae angular, plano-convex, 

 smooth, opake, (K yellow then red) ; apotheeia scattered or confluent, 

 sessile, adnate, black, slightly pruinose, plane or sub-convex, internally 

 white, margin thin, acute, elevated, flexuose ; hypothecium colour- 

 less, the margin only with a thin black line ; epithecium nigricant ; 

 thalamium pale-yellowish ; spores 8, colourless, ellipsoid, simple, 

 moderate, granular. 



On alpine rocks, not common. 1870. 



Stn :— Flk. D. Lich. 64. (1821.) Smmrf. Lapp. 144. Nyl. Scand. 227. Crombie 

 Enum. 82. L. spilota, Fr. L. E. 297. pr. p. 



Geog. Distrib : — Scandinavia, Lapland, Sweden, France, Germany, Hun- 

 gary, Italy, Switzerland. 



Bot. Prov:— 5...15...23. 



England : -Caer Caradoc ! Shropshire. 



Scotland : — Ben Lawers. Messrs. Jones and Carroll. 



Ireland : — Lough Bray near Dublin. Messrs. Jones <£■ Carroll. 



"Spores 0.011—17 mm. long, 0.007-0.010 mm. broad." (Nyl.) Spores 

 .011—16 mm. long, .006— .008 mm. broad. Medulla I—. 



109. L. spilota, Fr. similar externally and internally to L. 

 tessellata, Flk. but with a different chemical reaction K — C — . 



On alpine rocks, not common. 



I have never seen British specimens of the typical form, but the ferruginous 

 state, forma ochracea, (Ach. L. II. 166) frequently occurs. 



Stn :— Fries L. Eur. p. 297. (1831.) in part (specimen from Dr. Th. M. 

 Fries.) 



Exs :— Am. 260. Hepp 723. Anzi Langob. 124. 125. 126. 



Geog. Distrib :- Germany, Switzerland, Italy, Hungary, Sweden. 



Medulla I—. 



forma ochracea, (Ach.) thallus ferruginous ; apotheeia white within. 

 On alpine rocks, not common. 1856. 



Stn :— Ach. L. U. 166. (1810.) Crombie Enum. 82. 

 Exs :— Spruce Lich, Pyren. Anzi It. S. 272. Am. 468. Schaar. 188. 

 Geog. Distrib : — France, Pyrenees. 

 Bot. Pbov:-1...5...7...15. 



England : — Batheaston ! Mr. Broome. Mynydd-y-Myfyr ! near Oswestry, 

 Shropshire. 

 Wales : — Between Bala and Dolgelley ! (1856.) Pen-y-gwryd ! Snowdon. 

 Medulla I—, 



