442 LICHEN ACEI, [LECANORA. 
spores oblongo-ellipsoid, 0,011-18 mm. long, 0,007—9 mm. thick ; 
hymenial gelatine bluish, then sordid with iodine—Cromb. Lich. 
Brit. p. 52; Leight. Lich. Fl. p. 196, ed. 3, p.180; Sm. Eng. Fl. v. 
—Parmelia argopholis Wahl. in Ach, Meth. Suppl. (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 thalline 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. 
Hab. 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 Craggs, 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. Lich. 
Scand. p. 166.—Thallus subdeterminate, thickish, verrucoso-areolate 
or glebuloso-verrucose, whitish-yellow or white-sulphur-coloured, 
the glebules usually discrete, subradiately effigurate (K+ yellowish, 
CaCl—). Apothecia small, sessile, plane vr 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 ; Cromb. Lich. 
Brit. p. 52; Leight. Lich. Fl. p. 196, ed. 3, p. 179—Rinodina 
frustulosa Gray, Nat. Arr. i. p, 451. Lichen frustulosus Dicks. 
Crypt. fase. ili. (1793) p. 13, t. 8. f. 10; With. Arr. ed. 3, iv. p. 19; 
Eng. Bot. t. 2273.—Brit. Hws.: 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. 
Hab. On mica-schist rocks in alpine situations—Distr. Only, with 
certainty, on two of the S. Grampians, Scotland; reported by Dickson 
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. chloropheodes Nyl. Flora, 1873, p. 290.—Thallus 
effuse, verrucoso-granulate, moderate, yellowish-glaucous, the gran- 
ules subdispersed or conglomerate (K+ yellow, K (CaCl) + orange- 
red). Apothecia moderate, somewhat plane or convex, reddish-brown 
