LBCIDEA] LBCIDEACBa! 91 



Distinguished from L. tenehrica by the larger margined apotheoia 

 and by the chemical reactions. 



nah. On schistose rocks, sparingly, Bed Screes, Westmoreland. 



160. L. griseoatra Schser. Enum. p. 101 (1850).— Thallus 

 subdeterminate, thinnish or submoderate, somewhat smooth, 

 opaque, rimose-areolate or areolate-granulose, dark- or pale- 

 greyish or lead-coloured ; the areolae more or less tumid, crowded 

 or dispersed (K + yellowish, CaCl — , medulla I -f reddish) ; 

 hypothallus thin, black. Apothecia small, subinnate, at length 

 partly prominent, at first depressed, then plane, at times convex, 

 black, the margin thin, entire or obsolete; hypothecium thin, 

 nearly colourless or brownish ; paraphyses discrete, bluish-black 

 at the apices ; spores ellipsoid, 0,010-17 mm. long, 0,006-8 mm. 

 thick; hymenial gelatine bluish then sordid, the asci tawny- 

 wine-red, with iodine. — L. tenebrosa Mot. ex Nyl. in Act. Soc. 

 Linn. Bord. ser 3, i. p. 373 (1856) ; Mudd Man. p. 204 ; Cromb. 

 Lich. Brit. p. 85; Leight. Lich. Fl. p. 281; ed. 3, p. 283. 

 Verrucaria griseoatra Hoffm. Deutschl. Fl. p. 182 (1795). 



Exsiec. Leight. n. 188 (in some sets) ; Cromb. n. 185. 



From its appearance this has been placed in Lecanora, near 

 L. cinerea. The thallus is occasionally partly limited by the hypo- 

 thallus, which is in young plants radiating. In our specimens the 

 apothecia are usually numerous and not unfrequently abortive. The 

 asoi are cylindrioal-clavate, somewhat lax, and with the paraphyses 

 separate readily from the hypothecium. The spermogones, rarely 

 present, have the spermatia short, straight, baoUlar, 0,006-9 mm. long, 

 about 0,001 mm. thick ijide Th. M. Fries Lich. Scand. p. 541). 



Sab. On rocks in maritime and mountainous districts. — Distr. 

 Local, though plentiful where it occurs in the Channel Islands, 

 N. England and Wales, among the Grampians, Scotland ; apparently 

 rare in S.E. Ireland. — B. M. Noirmont, Jersey; Sark; Malvern 

 Hills, Worcestershire ; Cader Idris, Barmouth, and Dolgelly , Merioneth ; 

 Cwm Idwall, Nant Francon, Carnarvonshire ; Windermere, Westmore- 

 land ; Cleveland, Yorkshire ; Aohosragan Hill, Appin, Argyll ; Crian- 

 larich, Ben Lawers, and Ben-y-gloe, Perthshire ; Portlethen, Kincar- 

 dineshire; Glen Callater and Morrone, Braemar, Aberdeenshire; 

 Ben Nevis, Invernessshire ; near Cork. 



161. L. fuscocinerea Nyl. in Bot. Not. 1852, p. 177.— Thallus 

 efiuse rimose-areolate, unequal, greyish- or blackish-brown, the 

 areolae often warted and tuberculate (K — , CaCl — , medulla 

 K -)- yellow) ; hypothallus blackish. Apothecia moderate, ap- 

 pressed or adnata, somewhat plane with thin prominent margin, 

 usually thinly gyrose, variously flexuose or angulose, black ; 

 hypothecium brownish-black ; paraphyses slender, concrete, dark- 

 brown at the clavate apices ; spores subglobose - ellipsoid, 

 0,010-14 mm. long, 0,007-9 mm. thick; hymenial gelatine pale- 

 bluish then wine-red with iodine. — Leight. Lich. Fl. ed. 3, p. 285. 



Subsequently referred by Nylander (Lich. Scand. p. 231) to 

 L. tenebrosa Flot., which it resembles when the thaUus is darker 



