184 LECANO-LECIDEBI [bUBLLIA 



ser. 3, xvii. p. 113 (1852); Lindsay in Journ. Micr. Sci. v. 

 p. 34, t. 4, figs. 1-14 (1857) ; Mudd Man. p. 224, t. 4, f. 86. Lichen 

 parasiticus Sm. Engl. Bot. 1. 1866 (1808). 



Brit. Exs. Leight. nos. 191, 309, 310; Mudd n. 201. 



Included by some authors among the fungi owing to the absence 

 of a proper thallus ; it usually deforms the lobes of the host, e.g. 

 Parmelia saxaiilis and P. ompJialodes, whence these were supposed 

 by Soromerfelt to be its proper thallus. The erumpent apothecia are 

 at length subglobose. Intermixed with these, immersed pycnidia are 

 of common occurrence on the alien thallus. 



Sab. On the thalli of various foliaceous lichens — Parmelia 

 saxatiKs and var. furfuracea, P. omphalodes, P. tiliacea, P. exas- 

 perata, Stictina fuliginosa, Platysma glaueum, etc., in maritime, 

 upland and subalpine districts. — Distr. General and not uncommon 

 in Great Britain, apparently rarer in Ireland, rare in the Channel 

 Islands.— P. M. Jerbourg, Island of Guernsey ; Withiel, Cornwall ; 

 Torquay, Hay Tor and near the Bottor Eock, Dartmoor, S. Devon ; 

 Bridge, Sussex ; Essex ; North Hill, Malvern, Worcestershire ; Charn- 

 wood Forest, Leicestershire; Llyn Geironydd, Abergavenny, Mon- 

 mouthshire ; Aran Mawddwy, Cader Idris and Dolgelly, Merioneth ; 

 Ingleby Park, Cleveland, Yorkshire ; High Force, Teesdale, Durham ; 

 Barcaldine and Inverary, Argyll ; Glen Lochay, Killin, Craigie Hill, 

 Perth, Craig-y-Barns, Dunkeld and Glen Shee, Perthshire ; Canloohan, 

 Forfarshire ; Durris, Kincardineshire ; Countesswells, near Aberdeen ; 

 Glen Callater, Braemar, Aberdeenshire ; Glen Nevis, Invernessshire ; 

 Blarney, Cork ; Mangerton, Killarney, Kerry ; near Dawros, Oonne- 

 mara, Galway. 



38. B. particularis A. L. Sm. — Thallus absent. Apothecia 

 small, plane, margined, black ; paraphyses slender, not very well 

 discrete ; hymenium in thin section yellowish (K + somewhat 

 purplish) ; hypothecium and perithecium blackish ; spores ellipsoid, 

 brownish-black, 0,008-0,010 mm. long, 0,0035-45 mm. thick ; 

 hymenial gelatine deep-blue with iodine. — Lecidea particularis 

 Nyl. in Flora Ix. p. 461 (1877) ; Cromb. in Grevillea vi. p. 113 ; 

 Leight. Lich. Fl. ed. 3, p. 386. 



Exsicc. Larb. Lich. Hb. without number. 



Well characterized by the structure of the apothecia and by the 

 host upon which it occurs. The single specimen seen is fragmentary 

 and only sparingly fertile. 



Hah. On the thallus of Bceomyces ru/us (saxicolous). — B. M. 

 Near Kylemore, Connemara, Galway. 



39. B. advenula A. L. Sm. — Thallus absent. Apothecia 

 parasitic, minute, plane or slightly convex, rugulose, sub- 

 margLnate, blackish ; paraphyses concrete ; epithecium purplish- 

 black ; hypothecium brownish-black (K -f yellowish) ; spores 4 

 in the ascus, obtusely ellipsoid, blackish, 0,019-0,023 mm. long, 

 0,0014-16 mm. thick; hymenial gelatine deep-blue with iodine. 

 — Lecidea advenula Leight. in Trans. Linn. Soc. ser. 2, i. p. 146, 



