PARMELIA. | PARMELIEL, 235 
Hab. On the trunks of trees and on rocks in wooded maritime and 
mountainous districts.—Distr. Apparently very local and rare in 8. Eng- 
land (Danny, Sussex, fide Nyl.), in N. Wales, and the S.W. Highlands, 
Sostlent— M.: Drews-y-nant, Merionethshire. Barcaldine, Argyle- 
shire. 
3. P. cetrarioides Nyl. Flora, 1869, p. 290.—Thallus large, 
orbicular or expanded, subcoriaceous, smoothish, roundly lobed, 
glaucous-white ; beneath brownish-black or blackish, paler at the 
circumference, with few and short rhizine; lobes broad, crenate, 
olevated, crisp and sorediate at the margins (Kt°™8°ylow, CaCl, 
medulla K(CaCl)f+reddish). Apothecia moderate or large, badio- 
reddish, the margin entire ; spores 0,012-14 mm. long, 0,006-7 mm. 
thick.—Cromb. Lich. Brit. p. 34; Leight. Lich. Fl. p. 128, ed. 3, 
p- 119.—Purmelia perlata var. cetrarioides Del. in Dub. Bot. Gall. 
(1829) p. 601. 
Near to P. olivetorum, but usually (at least with us) a larger plant, and 
with a different medullary reaction with CaCl. It also resembles states 
of Platysma glaucum, from which the sparingly rhizinose under surface 
separates it. In some habitats, as also in herbaria, the thallus becomes 
brownish and the soredia form a fine narrow border on the margins of the 
lobes. The apothecia in this country are extremely rare, and only once 
. seen fully developed. The spermogones alsv are seldom present. 
Hab. On the trunks of old trees, rarely on rocks, in wooded maritime 
and upland districts.—Distr. Rather local and scarce in N. Wales, 
S. Scotland, and the W..Highlands; rare in the Channel Islands— 
B. M.: Rozel, Island of Jersey. New Forest, Hampshire; Isle of 
Wight; Dartmoor and Bickleigh Vale, Devonshire; Helminton, Corn- 
wall; Dolgelly, Aberdovey, and near Barmouth (iruit), Merionethshire ; 
Island of Anglesea. New Galloway, Kirkcudbrightshire; Appin, Argyle- 
shire; Loch Katrine, Perthshire ; Loch Linnhe, Inverness-shire. 
4. P, perforata, Ach. Meth. (1803) p. 217.—Thallus suborbicular, 
membranaceous, imbricato-lobed or lobato-laciniate, smooth, mi- 
nutely reticulato-rimulose, whitish or glaucous-white, beneath 
brownish-black or black, with black dense rhizin ; lobes crenato- 
sinuate or sinuato-divided, often white-sorediate and occasionally 
s i lowish, =e ice 
ciliate at the margins (Bow, eh pasty t08; CaCl_). Apothecia 
moderate, perforate in the centre, badio-reddish or brownish-red, the 
margin entire; spores 0,011-18 mm. long, 0,007-11 mm. thick.— 
Sm. Eng. FI. v. p. 204 pro parte; Cromb. Lich. Brit. p. 32; Leight. 
Lich, Fl. p. 184, ed. 3, p. 123.—Lichen perforatus, Wulf. in Jacq. 
Coll. i. (1786) p. 116, t.3; Eng. Bot. t. 2428 (mid. fig.). Parmelia 
reticulata, Tayl. in Mack. Fl. Hib. ii. p. 148. Parmelia perlata, 
B. ciliata, Mudd, Man. p. 92 pro parte, Lichenoides glaucum, foli- 
arum lacintis crinitis, Dill. Musc. 149, t. 20. f. 42 a.—Brit. Hus. : 
Cromb. n. £9; Larb. Lich. Hb. n. 250. 
Closely allied to P. perlata, but with the appearance of P. ciliata, 
which, a3 already intimated, has been frequently confounded with it by 
