PHYSCIA. | PHYSCIEI. 305 
and Roughton, Cornwall; Barmouth, Cwm Bychan, and Llyn Bodlyn, 
Merionethshire. Barcaldine and Ballachulish, Argyleshire; Glen Fal- 
loch, Perthshire. Dunkerron and Killarney, co. Kerry. 
Var. 3. hypoleuca Nyl. Syn. i. (1860) p. 417.—Thallus usually 
firmer, with the lacinise more closely imbricate; beneath white, 
here and there hispid with black rhizine, the marginal cilia black. 
Apothecia with the margin of the receptacle crenate or radiato- 
fimbriate-—Cromb. Grevillea, xv. p. 78.—Puarmelia speciosa var. 
hypoleuca Ach, Syn. (1814) p. 211. Parmelia speciosa Tayl. 1. c. 
pro parte. Lichen speciosus Eng. Bot. t. 1979 (lower figs.). 
An exotic variety which finds its way to S.W. Ireland. The thallus 
in our British ‘specimens is more sorediate than in the type; and the 
margin of the apothecia, which are somewhat large and crowded, is 
thickish, crenate, and densely pulverulent. : 
Hab. On rocks in shady upland situations—Disér. Extremely local 
and rare in 8. W. Ireland.—B. M.: Dunkerron, co. Kerry. 
10. P. pulverulenta Nyl. Act. Soc. Linn. Bord. sér. 3, i. (1856) 
p. 808.—Thallus suborbicular, somewhat firm, substellato-appressed, 
opaque, multifido-laciniate, pale-greyish or greyish-brown, more or 
less white-pruinose; beneath rough with dense blackish fibrillose 
rhizine ; lacinize plane, obtuse and crenato-incised at the apices 
(K_, CaCl_). Apothecia sessile, large, concave or plane, brownish- 
black, cesio-pruinose or naked, the margin thick, inflexed, entire, 
pruinose; spores oblong, 0,020-36 mm. long, 0,012-20 mm. thick. 
—Cromb. Lich. Brit. p. 88; Leight. Lich. Fl. p. 146, ed. 3, p. 185. 
—Borrera pulverulenta Mudd, Man, p. 110. Parmelia pulverulenta 
Gray, Nat. Arr. i. p. 443; Hook. Fl. Scot. ii. p. 55; Sm. Eng. Fl. 
v. p. 201; Tayl. in Mack. Fl. Hib. ii. p.141. Lichen pulverulentus 
Schreb. Spic. (1771) p.128. Lichen stellaris 6. Huds. Fl. Angl. 
p. 448; With. Arr. ed. 3, iv. p.31. Lrchenoides glaucum orbiculare, 
segmentis latiusculis, scutellis nigris Dill. Muse. 177, t. 24. f. 71 
pro parte. Lichenoides arboreum, crusta foliosa virescenti, tenuiter et 
eleganter dissecta, scutellis nigris Dill. in Ray Syn. ed. 3, p. 74,n. 73 
pro parte.—Brit. Evs.: Leight. n. 49; Mudd, n. 82; Larb. Lich. 
Hb. n. 10; Bobl. n. 69. 
This may generally be recognized by the pruina, with which, when 
growing and in a dry state, it is more or less covered. As noticed, how- 
ever, by Acharius (Lich. Univ. p. 474), when wetted the pruina disappears 
both in the thallus and apothecia, the former being then greenish and the 
latter black; but when again dried the pruina returns in both. The 
colour in a dry state varies in recent specimens from pale greyish to 
greyish brown, and, as observed by Lightfoot (7. e. p. 825), specimens 
after being kept for some years in paper (or in herbaria) turn to a russet- 
grey (or cervine). In other respects the thallus and apothecia vary con~ 
siderably in character, giving rise to the subspecies, forms, and varieties 
which follow. The apothecia are generally somewhat scattered, though 
x 
