442 LJCHENACEI. [LECANORA. 



spores oblongo-ellipsoid, 0,011-18 mm. long, 0,007-9 mm. thick ; 

 hymenial gelatine bluish, then sordid with iodiue. Croinb. Lich. 

 Brit. p. 52 ; Leight. Lich. M. p. 196, ed. 3, p. 180; Sm. Eng. Fl.v. 

 Parmelia argopholis Wahl. in Ach. Meth. ISuppl. (1803) p. 32. 



Varies considerably in the colour of the thallus, which in the British 

 specimens is usually whitish, so that these might be taken for 

 L. gangaleoides, but for the character of the thalliue granules and the 

 often crenate margin of the apothecia. These are numerous and crowded, 

 becoming somewhat angulose. The spermogones are frequent with the 

 usual arcuate spermatia of this subsection. 



Hub. On rocks in hilly and mountainous districts. Distr. Apparently 

 local in S.W. and N. England, N. Wales, the S.W. Highlands and the 

 S. Grampians, Scotland, and N.W. Ireland. B. M. : Cleve Hill, 

 Somersetshire ; Trefriw, Carnarvonshire ; Pugh Crag, Westmoreland ; 

 Gunnerton Cragg*, Northumberland. Achosragan Hill, Appin, Argyle- 

 shire ; Craig Calliach and Ben Lawers, Perthshire. Near Letter Hill, 

 Connemara, co. Galway. 



131. L. frustulosa Ach. Lich. Univ. (1810) p. 405; Nyl. Lioh. 

 Scand. p. 166. Thallus subdeterminate, thickish, verrucoso-areolate 

 or glebuloso-verrucose, whitish-yellow or white-sulphur-coloured, 

 the glebules usually discrete, subradiately effigurate (K-j- yellowish, 

 CaCl ). Apothecia small, sessile, plane or somewhat convex, 

 brownish-black ; the thalline margin thickish, entire or subcrenulate, 

 at length excluded; spores oblongo-ellipsoid, 0,010-12 mm. long, 

 0,005-6 mm. thick ; paraphyses coherent, brownish at the apices ; 

 hymenial gelatine bluish, then sordid with iodine. Hook. Fl. Scot. 

 ii. p. 48 ; Sm. Eng. Fl. v. p. 189 : Mudd, Man. p. 145 ; Croinb. Lich. 

 Brit. p. 52; Leight. Lich. Fl. p. 196, ed. 3, p. W.Rinodina 

 frustulosa Gray, Nat. Arr. i. p. 451. Lichen frustulosus Licks. 

 Crypt, fasc. iii. (1793) p. 13, t. 8. f. 10 ; With. Arr. ed. 3, iv. p. 19 ; 

 Eng. Bot. t. 2273. Brit. Exs. : Leight. n. 293 ; Cromb. n. 165. 



Sometimes regarded as a variety of the preceding, to which it is nearly 

 related, but is sufficiently distinguished by the characters given of the 

 thallus and apothecia, as also by the altitude at which it grows in this 

 country. It is rather a fine plant, conspicuous by the colour of the 

 thallus amongst the darker cryptogamic vegetation with which it is 

 associated on the rocky ledges. At times it is well fertile, though the 

 apothecia are more or less scattered. 



Hob. On mica-schist rocks in alpine situations. Distr. Only, with 

 certainty, on two of the S. Grampians, Scotland ; reported by JDickson 

 from Yorkshire, but this is extremely doubtful, and by Leighton erro- 

 neously from the Island of Anglesea. B. M. : Summits of Craig 

 Calliach and Ben Lawers and above Loch-na-Gat, Ben Lawers, Perth- 

 shire. 



132. L. chlorophaeodes Nyl. Flora, 1873, p. 290. Thallus 

 effuse, verrucoso-grauulate, moderate, yellowish-glaucous, the gran- 

 ules subdispersed or conglomerate (K+ yellow, K(CaCl) + orange- 

 red). Apothecia moderate, somewhat plane or convex, reddish-brown 



