PAHMELIA.] I'ARMi;r.Ti:r. -'-'''i 



It m:iy Lr dividod into tlii' Inllowiii;,'' sections (or siil)fi<'iifia) and siilj- 

 sf'ctious, accoidiiij,' to the presonce or absence of rlii/.ina; and the colour of 

 tlie tlialliis. 



A. KHIZINO.SvE. — Thallus more or less distincily fibrilloso- 

 rhizinosc beneath (subgenus Ihiporhizia Cromb. Grevillea, xv. 

 (1.S87) p. 74). 



a. Glaucescentes. — Thallus normally grey, greyiah-white or 

 glaucous. 



1. P. perlata Ach. ]\[cth. (1803) p. 21(5. — Thallus orbicular or 

 expanded, iinbrieato-lobed, smooth, glaucous- or greyish-white ; 

 beneath somewhat shining, brownish-black or blackish, paler at the 

 circumference, with short scattered rhizimo ; lobes rounded, often 



white-sorediatc towards the margins (K+"[.;\'^|^"y*'"*"''' CaCl"). 



Apothecia moderate or large, scattered, badio-reddish, the margin 

 thin, entire; sjwres 0,011-17 mm. long, 0,007-12 mm. thick. — 

 Gray. Nat. Arr. i. p. 437 ; Hook. Fl. 8cot. ii. p. 52 ; 8m. Eng. Fl. 

 V. p. 200 ; Tayl. in Mack. Fl. Hib. ii. p. 148 ; Mudd, Man. p. !)2 ; 

 Cromb. Lich. 15rit. p. ;j;3 ; Lcight. Lich. Fl. p. 128, ed. 3, p. 11!*. 

 — Lichen pcrlatas Linn. 8vst. Nat. ed. 12 (1767) p. 712; Huds. 

 Fl. Angl, p. 448 ; Lightf. Fl. 8cot. ii. p. 839 ; With. Arr. ed. 3, 

 iv. p. ()8. Liclienoidcs (jlaacani perhitum^suhtas }ii(/i'um et cirrhosnm 

 Dill. Muse. 147, t. 20. f. 3l», a, b, d, e. — Brit. Exs.: Leiglit. n. 70. 

 3U2 ; Larh. Lich. Hb. n. 2U1. 



Several species were included under this which have been definitely 

 separated by the chemical reactions of the meduUa. F. perlata is now 

 seen to be a much less variable plant than was sujipo.sed, though the 

 thallus varies in the presence or absence of soredia. The apothecia are 

 very rare in this country, uor are the spernugones often seen. \\ lien 

 present, they are scattered, minute, blackish, with spermatia about 

 0,00o-0 mm. long, scarcely 0,001 nun. thick. 



Hab. On the trunks of old trees and on rocks in maritime and upland 

 tracts. — Diftr. General and often plentiful in most parts of Great llritaiu 

 and in the Channel Islands; apparently rare in Ireland. — B. M. : Islands 

 of Jersey, 8ark, and Guernsey. St. Leonard's Forest, near Brighton, 

 Ileufield, and Arundel, Sussex ; Lyndhurst, New Forest, Hants ; Isle of 

 AVight ; Torquay, South Brent, tlay Tor, Dartmoor, and IllVaconibe, 

 Devonshire; Bocconoc, near Penzaiice, and AVithiel, Cornwall; near 

 Cheltenham, Gloucestershire ; Twycross, Leicestershire ; Ilarboro" Magna, 

 Wai'wickshire ; Wrighton Park, lleref irdshire ; Ilaughmond Ilill. Shrop- 

 shire ; Llanbedr, Barmouth, and Dolgelly, Merionethshire; Bousdale 

 Gill, Cleveland, Yorkshire ; Stavely, Kendal, and AVindermere, West- 

 moreland. New Galloway, Kirkcudbrightshire ; near Inverary and Jiar- 

 caldine, Arpryleshire ; Loch Katrine and Killin, Perthshire ; S. of Fort 

 William, Lochaber, Inverness-shire ; Applecross, lioss-shire. Near 

 Cork ; Duukerrou, co. Kerry. 



Subsp. P. ciliatl Nyl. Flora, 1878, p. 247. — Thallus moderate 

 or large, imbricato-lobed, smoothish, often isidiiferous, white or 



