LECAN-QRA.] LECANO-LECIDEEI. 467 



Hub. On rocks and walls in maritime and mountainous tracts. Distr. 

 Rather local, though plentiful where it occurs in Great Britain, Ireland, 

 and the Channel Islands. E. M. : La Coupe, Island of Jersey ; Moulin 

 Huet Bay, Guernsey. Bray Hill, St. Minver, Cornwall ; Cader Idris and 

 Barmouth, Merionethshire ; Snowdon, Carnarvonshire ; Teesdale, Durham. 

 Barcaldine, Argyleshire ; Glen Lochay, Killin, and Ban Lawers, Perth- 

 shire ; Portlethen, Kincardineshire. " Lanibay Island, co. Cork ; co. 

 Wicklow. 



Form lepidota Leight. Grevillea, iii. (1875) p. 116; Lich. El. 

 ed. 3, p. 173. Thallus greyish-brown, squamuloso-areolafce, the 

 squamules convex, often rugose. Apothecia innate, small ; the 

 thalline margin, persistent. Cromb. Grevillea, xix. p. 57. 



Differs in the more squamulose and darker thallus, which renders it a 

 good form, if not a distinct variety. Both apothecia and spermogones 

 are frequent in the specimens seen. 



Hob. On maritime rocks and bv lakes in mountainous districts. 



Distr. As yet only in the Channel Islands and N. Wales. B. M. : 



Beauport, Island of Jersey. Llyn Dinas, near Beddgelert, Carnarvon- 

 shire. 



Subsp. L. epiglypta Nyl. Flora, 1881, p. 4. Thallus rimoso- 

 areolate, dark-greyish, the areolae plane. Apothecia at length 

 prominent, somewhat convex, the epithecium crowdedly corrugate 

 or ruguloso-insculpt : otherwise as iu the type. Cromb. Grevilica, 

 xix. p. 57. 



Well distinguished by the peculiar character of the epithecium, which 

 gives the fruit as it were a gyrose appeai'ance. This, however, is not 

 visible in the young urceolate apothecia. The spermogones are frequent, 

 with spermatia straight, 0,015-23 mm. long, 0,0005-G mm. thick. 



Hob. On schistose rocks in maritime and mountainous districts. Distr. 

 Only very sparingly in N. Wales and the S. W. Highlands of Scotland. 

 B. M. : Cader Idris, Merionethshire. Barcaldine, Argyleshire. 



164. L. intermutans Nyl. Flora, 1872, pp. 354, 429. Thallus 

 determinate, diffracto-areolate, whitish or caesio-greyish (K + yellow, 

 then rusty red, CaCl ). Apothecia submoderate, immersed, con- 

 cave, blackish ; the thalline margin entire, at length inflexed ; spores 

 usually 8n, 0,023-34 mm. long, 0,009-0,015 mm. thick ; hy- 

 menial gelatine bluish, then wine-red with iodine. Cromb. 

 Grevillea, xix. p. 57. 



Closely allied to the preceding species, but differs in the larger spores 

 and the much shorter spermatia, which are 0,007-9 mm. long, scarcely 

 0,001 mni. thick. Nylander says that the thallus in the E. Pyrenees is 

 at times milkj'-white, and often occurs insulated, from the intrusion of 

 rudimentary thalli of other species. In the single British (fragmentary) 

 specimen seen it is associated with Lecanora atra. 



Hob. On schistose rocks in a maritime district. Distr. Extremely local 

 and scarce in W. Ireland. B. M. : Near Kylemore, Connemara, co. 

 Galway. 



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