234 IJCIIEX.VCEI. [PARMELIA. 



glaucous-white, beneath black, glabrous, rugulose, the lobes eroso- 



crenate and ciliate at the margins (K^]°|[|"^°^'-*^ °"' 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. — 

 J'armelia perlata /5. ciliata Mudd, Man. p. 92 pro parte ; Cromb. 

 Lieh. Brit. p. 32 ; Leight. Lich. Fl. p. 129, ed. 3, p. 120. Loharia 

 jH-rlata var. ciVtata DC. Fl. Fr. ii. (1805) p. 403. Parmelia pro- 

 boscidea Tayl. in Mack. Fl. Hib. ii. p. 143. PunneUa perforata 

 Sm. Eng. Fl. v, p. 200 pro parte. Licheti p)^''foratns Eng. Bot. 

 t. 2-123 pro parte. — As Xylander observes (Flora, 1S()9, p. 91), this 

 should perhaps be referred to P. crinita Ach. — Brit. Kvs. : Larb. 

 Cffisar. n. 17 ; Lich. Hb. n. 8G ; Leight. n. 112 ; Cromb. n. 30. 



Differs from the type in being frequently more or less coralloideo- 

 isidiitercus (form e(«-t'.<ce?(.s Arn.) and in having the lobes, which are 

 occasionally di^^sec■ted at the margins ( form diiiscctu/a Xyl. in Leight. Br. 

 Fl. iii. p. 1:^0). fringed \\ith elongated cilia, which are sometimes shorter 

 iir almost waiitii.g. These difterences, and the character of the margins 

 (jf the apotheciaj" entitle it tu 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. 



JJab. On the trunks of old trees, as also on rocks and boulders in shady 

 places in maritime and upland districts. — Di-str. General in S. and 

 W. Emrland and N. AVales : rarer in the AN'. liighlar.ds of Scotland, 

 \V. Ireland, and the Channel Islands. — B. M. : E. coast of Jersey; Island 

 of Guernsey. High IJocks, Tunbridge Wehs, Kent : St. Leonard's Forest, 

 Sussex ; Isle of AVight ; Lustleigh Cleeve, Hay Tor, Lydford, and Bolt 

 Head, Devonshire ; near Penzance and Helmiuton, Cornwall ; St. Mary's, 

 Scillv Islands ; Malvern, AVorcestershire ; Dolgelly, Xannau, and Bar- 

 mouth, Merionethshire; Eiver Elwy, Carnarvonshire; Keswick and 

 Eskdale, Cumberland : near Kendal, Westmoreland. Xew Galloway, 

 Kirkcudbrightshire ; near Helensburgh, Dumbartonshire ; Barcaldine, 

 Argyleshire ; shores of Loch Tay, Perthshire ; Lochaber, Inverness- 

 . shire ; Applecross, Ross-shire. Dunkerron Mts., KiUarney, and Dinis, 

 CO. KeiTV ; Counemara, co. Galway. 



2, P. olivetorum Xj-1. Xot. Siillsk. pro F. etFl. Fenn. Fcirh. n. s. 

 V. (1SG6) p. ISu. — Thallus expanded, roundly lobed, smooth, 

 grc\ish-green ; beneath blackish, very sparingly and shortly rhi- 

 ziuose, lobes elevated, crisp, incurved, thickened and white-sorediate 



ut the margins (K+^®^^'^^, CaClTre^)- Apothecia moderate, reddish- 

 brown, the thalline margin entire ; spores 0,014-18 mm. long, 

 0,007-12 lum. thick. — Leight. Lich. Fl. p. 130, cd. 3, p. 121. — 

 ' ParnuUci perlcda jo. olivetorum Ach. Lich. Univ. (1810) p. 458. 



From the sorediate states of P. perhifn this is at once distinguished by 

 tlie ditierent reaction of the medulla with CaCl. The soredia are minute, 

 cuntiiied to and bordering the nuirgins of the lobes. AVIien growing, and 

 in wet weather, it is of a greeni.-^h colour, resulting from the cortical layer 

 bein"- subhyaline (Xylander, Pyr. Or. p. ItJ). Xeilher apothecia nor 

 spermogones are present in our British sjiecimens. 



