•J 



51 



Lich. r>iit. p. 5, and C. suhpUcatile, var. meizolobmn Nyl., Cronib. Joiirn. 

 Bot. 1874, p. 334; but these are conueeted by intermediate slates. The 

 apothecia are rare and scarcely seen in the larger condition. 



Ilab. On calcareous waUs and rocks, rarely among mosses on tht; 

 ground in upland districts. — Distr. Probably general and common in the 

 hilly and mountainous tracts of Great Britain and Ireland. — B. M. : 

 Shanklin, Isle of Wight; rivmouth, Elburton, Paington, Ogwell, and 

 near Kingsbridge, S. Devon; St. Miuver, Cornwall ; Bathampton Downs, 

 "Weston-super-Mare, and Cheddar Clitl's, Somersetshire ; Leigh A\'oods, 

 near Bristol, Gloucestershire ; Tenby, Pembrokeshire ; Beaumaris, Island 

 of Anglesea ; near Buxton, Derbyshire ; Pentregaer, Oswestr}', Shrop- 

 shire ; Kedcar, Cleveland, Yorkshire ; near Whitehaven, Cumberland. 

 Appin, Argyleshire ; Killin and Ben Lawers, Perthshire ; S. of Fort 

 WiUiam, Inverness-shire. Killaruey, co. Kerry ; near Kylemore and 

 Becess, Counemara, co. Gal way. 



17. C. inelaenum Acli. Licli. Univ. (ISIO) p. G3G. — Thallus de- 

 pressed, lacero-laciuiatc, greenish- or olive-black (I wine-red iu thiu 

 section); lacinite more or less elongate, somewhat broad and imbricate, 

 the margins elevated, undulate, crisp and crenate. Apothecia mode- 

 rate, sessile or slightly elevated, submarginal, plane, reddish-brown 

 or blackish, the thalline margin somewhat granulate ; spores ovoid, 

 2-3-septate and irregularly divided, 0,021-27 mm. long, 0,009- 

 11 mm. thick. — Mudd. Man. p. 37: Cromb. Lich. Brit. p. 5 

 pro parte : Journ. Bot. 1874, p. 334 : Leight. Lich. Fl. p. 19 pro 

 parte, ed. 3, p. 20. — Lichen melmius Ach. Prodr. (1798) p. 130, C. 

 (lu/'lculatumysiT.jnJiguesanslsyl. Flora, 1S72, p. 353; Cromb. Journ. 

 Bot. 1873, p. 133 ; Leight. Lich. Fl. ed. 3, p. 17 (cfr. Xvl. Flora, 

 1883, p. 534). 



The depressed orbicular thallus, and the form of the laciniae readilv 

 distinguish this fi'om the allied species. In favourable situations it is 

 often considerably expanded, and then iu old plants becomes centrifugal. 

 The apothecia are not uncommon, generally numerous, situated 

 towards the margins, and at length slightly convex and cuncolorous 

 with the thaUus. On the sterile thaUtis is rarely seen a parasitic Obryzum, 

 which must not be confounded with the spermogones. 



Hab. On calcareous rocks and old waUs in maritime and upland 

 districts. — Distr. Local and scarce inX, England, the "W., Central, and N. 

 Highlands of Scotland. — B. M. : Near Buxton, Derbyshire ; Teesdale, 

 Durham; Kendal, "Westmoreland ; near Alston, Cumberland. Island of 

 Lismore and Appin, Argyleshire ; Kilhn, Ben Lawers, and Craig Tulloch, 

 Perthshire ; Craig Guie and Morrone, Braemar, Aberdeenshire ; Coygach, 

 Sutherlandshire. 



Form 1. marginale Ach. Lich. Univ. (1810) p. 637. — ThaUus 

 elongato-laciniate, lacinite narrow, canalictdate, the margins crisp 

 and crenate. Apothecia marginal, scattered, the thalline margin 

 prominent and entire — Mudd, Man. p. 37; Cromb. Jotirn. Bot. 1874, 

 p. 334 ; Leight. Lich. Fl. ed. 3, p. 21. — CoJlema man/inale Hook. Fl. 

 Scot. ii. p. 71 : Engl. Fl. v. p. 210 ; Tayl. in Mack. FI. Hib. ii. p. l09. 

 Ktuhi/liuin nuiD/iitcdt Grav. Nat. Arr. i. p. 397. Lichen ^aaryinulis 



e2 



