234 LICHENACEI. [PARMELIA. 
glaucous-white, beneath black, glabrous, rugulose, the lobes eroso- 
crenate and ciliate at the margins Sa Sa CaCl~). Apo- - 
thecia moderate or large, scattered, elevated, urceolato-subpedicellate, 
badio-reddish, the margin frequently eroso-crenate and sometimes 
ciliate ; spores as in the preceding.—Cromb. Grevillea, xv. p. 74.— 
Parmelia perlata 3. ciliata Mudd, Man. p. 92 pro parte; Cromb, 
Lich. Brit. p. 82; Leight. Lich. Fl. p. 129, ed. 3, p. 120. Lobaria 
perlata var. ciliata DC. Fl. Fr. ii. (1805) p. 408. Parmelia pro- 
boscidea Tayl. in Mack. FI. Hib. ii. p. 143. Parmelia perforata 
Sm. Eng. Fl. v. p. 200 pro parte. Lichen perforatus Kng. Bot. 
t. 2423 pro parte-—As Nylander observes (Flora, 1869, p. 91), this 
should perhaps be referred to P. crinita Ach.— Brit. Has.: Larb. 
Cesar. n. 17; Lich. Hb. n. 86; Leight. n. 112; Cromb. n. 30. 
Differs from the type in being frequently more or less coralloideo- 
isidiiferous (form everescens Arn.) and in having the lobes, which are 
occasionally dissected at the margins (form dissectula Ny]. in Leight. Br. 
FL iii. p. 120), fringed with elongated cilia, which are sometimes shorter 
or almost wanting. These differences, and the character of the margins 
of the apothecia, entitle it to rank at least as a subspecies, if not as 
a distinct species. In this country, as in most other parts of Europe, the 
apothecia are rare. They are usually scattered, though sometimes two or 
three are congregate and smaller. 
Hab. On the trunks of old trees, as also on rocks and boulders in shady 
places in maritime and upland districts.—Dvstr. General in S. and 
‘W. England and N. Wales; rarer in the W. Highlands of Scotland, 
W. Ireland, and the Channel Islands.—B. M.: E. coast of Jersey; Island 
of Guernsey. High Rocks, Tunbridge Wells, Kent ; St. Leonard’s Forest, 
Sussex; Isle of Wight; Lustleigh Cleeve, Hay Tor, Lydford, and Bolt 
Head, Devonshire ; near Penzance and Helminton, Cornwall; St. Mary’s, 
Scilly Islands; Malvern, Worcestershire; Dolgelly, Nannau, and Bar- 
mouth, Merionethshire; River Elwy, Carnarvonshire; Keswick and 
Eskdale, Cumberland ;, near Kendal, Westmoreland. New Galloway, 
Kirkcudbrightshire; near Helensburgh, Dumbartonshire; Barcaldine, 
Argyleshire; shores of Loch Tay, Perthshire; Lochaber, Inverness- 
shire; Applecross, Ross-shire. Dunkerron Mts., Killarney, and Dinis, 
co. Kerry ; Connemara, co. Galway. 
2. P. olivetorum Nyl. Not. Sallsk. pro F. et Fl, Fenn. Forh. n. s. 
v. (1866) p. 180.—Thallus expanded, roundly lobed, smooth, 
greyish-green ; beneath blackish, very sparingly and shortly rhi- 
zinose, lobes elevated, crisp, incurved, thickened and white-sorediate 
at the margins (KTY ellow CaCly rea): Apotbecia moderate, reddish- 
brown, the thalline margin entire; spores 0,014-18 mm, long, 
,0,007-12 mm. thick.—Leight. Lich. Fl. p. 130, ed. 3, p. 121.— 
Parmelia perlata 3. olivetorum Ach. Lich. Univ. (1810) p. 458. 
From the sorediate states of P. perluta this is at once distinguished by 
the different reaction of the medulla with CaCl. The soredia are minute, © 
confined to and bordering the margins of the lobes. When growing, and 
in wet weather, it is of a greenish colour, resulting from the cortical layer 
being subhyaline (Nylander, Pyr. Or. p. 16). Neither apothecia nor 
spermogones are present in our British specimens. 
