J. A. MARTINDALE : NOTES ON BRITISH LICHENS. 359 



thallus. Paraphyses stout, articulated, branched just below 

 the apex, upper cells remarkably swollen, the apical cell 

 •oo6-*oTo in diameter. Spoj-es ellipsoid, •oo9--oi5 mm. 

 long and •oo4-*oo7 mm. broad. In some plants the 

 spores do not exceed -013 mm. in length, but have the 

 usual breadth. 



Spermogonia minute, reddish. Sperinatia borne on arthrosterig- 

 mata, straight, •oo25-'oo3 mm. long and 'ooo5-'ooo7 mm. 

 broad. 



On limestone walls and on mortar. 



Distribution unknown, owing to the confusion between 

 it, sympagea, and other species. I have recently gathered 

 a thin naked form of it at Heversham, Kendal, and Shap, 

 but only sparingly at each place. From sympagea^ which 

 has often been called vmrorum^ it may be known at once 

 by its ellipsoid spores and shorter spermatia. All the ex- 

 siccati quoted in Leighton's 3rd edition, with the exception 

 of Hepp., 196, are sympagea. In the ist edition of the work 

 he quoted Schar., 479, and Mass., 97, 98, which belong to the 

 true murortijn, but these he has omitted in his last edition. 

 6. ■^Lecanora decipiens (Arn. in Flora, 1866, p. 529); Nyl. in Flora, 

 1883, p. 106 ; Leight., Lich. Flora, p. 161. 



Exs. — Hepp., 196, pro parte; Rabh., 904; Arn., 222b, 

 445 ; Rabh., 850 (state). 

 Thallus closely adnate, verrucose at the centre, shortly plicato- 

 lobate at the circumference : central warts, turgid, rounded, 

 crowded, often breaking up into pulverulent soredia ; peri- 

 pheral lobes radiating, sub-imbricate, convex, thick, varying 

 from "3 to i mm. broad, widening towards the front before 

 branching, apices incurved, crenato-incised, surface very 

 rough, yellow. 



Apothecia sunk among the centre verrucse, with a fulvous or 

 reddish or sometimes white pruinose disc, surrounded by a 

 rough entire border which is eventually somewhat granulato- 

 crenate or sometimes obsolete. Pa7-aphyses stout, articu- 

 lated, shortly and sometimes crowdedly branched just below 

 the apex, two or three upper cells enlarged, apical cell sub- 

 spherical, •oo5-*oo6 mm. diam. Spores oblong or oblongo- 

 ellipsoid with blunt ends, -oio to -017 mm. long and -004- 

 •007 mm. broad. 



Spermogonia minute. Spermatia borne on arthrosterigmata, 

 oblongo-bacilliform, •oo3-"oo35 mm. long, •ooo7--ooo9 mm. 

 broad, Nyl, Lc. 



Dec. 1887. 



