PARMELTIA, | PARMELIEL, 239 
&. P. tiliacea Ach. Meth. (1803) p. 215.—Thallus orbicular, 
membranaceous, appressed, smoothish or partly rugulose, laciniato- 
lobed, pale greyish-glaucous, subpruinose; beneath brownish black 
and black-fibrillose ; lobes short, subimbricate, rounded and sinuato- 
crenate at the margins (K*Y elleyaah, CaCly 9g): Apothecia mode- 
rate, crowded, concave or nearly plane, badio-reddish, the margin 
subentire; spores 0,007-11 mm. long, 0,005-7 mm, thick.—Gray, 
Nat. Arr. i. p. 438; Sm. Eng. Fl. v. p. 204 pro parte; Mudd, Man. 
p. 93, t. it. f. 28; Cromb. Lich. Brit. p. 33 pro parte; Leight. Lich. 
Fl. p. 131 pro parte, ed. 3, p.121 pro parte.— Lichen tiliaceus Hoffm. 
Enum. (1784) p. 26 pro parte, t. xvi. f. 2; Dicks. Crypt. fase. iii. 
p. 16; With. Arr. ed. 3, iv. p. 31.—Brit. Hvs.: Larb. Lich. Hb. 
n. 292. 
Well distinguished from both the preceding species by having the 
thallus more closely appressed and somewhat pruinose, with the laciniz 
more contiguous, narrowly sinuate and crenate at the margins. As men- 
tioned by Acharius /. c., the lobes towards the centre of the thallus are 
more rugose (var. ragosula Leight. Lich. Fl. p. 131, ed. 3, p. 121), especially 
seen in old plants. The apothecia are chiefly central, and the spermogones 
are not uncommon. They are rather prominent, brownish-black, with 
spermatia 0,007 mm. long, 0,001 mm. thick. 
Hab. On the trunks of trees, rarely on rocks, in maritime and upland 
districts.— Distr. Local and scarce in the Charnel Islands, 8. and N. 
England, N. Wales; not yet seen in Scotland, nor with certainty in Ire- 
land.—B. M.: Petit Port, Island of Jersey. Esher, Surrey; Glynde, 
Sussex ; near Ryde, Isle of Wight ; Lymington, Hampshire; near Exeter 
and Ilsham, Torquay, Devonshire ; near Barmouth and Harlech, Merion- 
ethshire ; Clapdale, Yorkshire; near Kendal, Westmoreland. 
Subsp. P. carporhizans Cromb. Grevillea, xv. (1887) p. 75.— 
Thallus similar to that of P. tiliacea (K*IM, CaCly a). Apo- 
thecia moderate, often excentrically perforate, badio-reddish, the 
receptacle beneath black-setulose, the margin subentire or slightly 
crenulate ; spores ellipsoid, 0,009-11 mm. long, 0,004-6 mm. thick. 
—Parmelia carporhizans Tayl. in Hook. Journ. Bot. vi. (1847) 
p. 163; Cromb. Journ. Bot. 1882, p. 272. Parmelia tiliacea Cromb. 
Lich. Brit. p. 33 pro parte; Leight. Lich. Fl. p. 131 pro parte, ed. 3, 
p- 121 pro parte. Lichen tiliaceus Eng. Bot. t. 700. 
When sterile, scarcely to be distinguished from P. tiliacea, but at least 
a good subspecies, characterized by the short, blackish, setulose fibrils with 
which the thalline receptacle of the fruit is densely clothed beneath. In 
this respect, as pointed out by Taylor /. ¢., it is analogous to Physcia ulo- 
thrix. The apothecia are plentiful when they occur, and frequently be- 
come perforate, though the perforations are not exactly in the centre, as 
in P. perforata, 
Hab, On the trunks of trees in wooded maritime and upland districts. 
—Distr. Local but not uncommon in 8. England and the Channel Islands. 
—B. M.: Near Jerbourg, Island of Guernsey. Lymington, Hampshire ; 
Chagford, Ashburton, and Cornworthy, 8S. Devon; Dunster Tower, 
Somersetshire. 
