J. A. MARTINDALE : NOTES ON BRITISH LICHENS. 



Thallus very closely adnate, rimoso-areolate or continuous at 

 the centre, lobate at the circumference ; lobes radiating, 

 soft-looking, '5-1 '5 mm. broad, very thin, flattened, con- 

 tiguous, margins overlapping, becoming obsolete, leaving 

 only very narrow rimse or shallow channels between the 

 contiguous lobes, apices rounded, pale yellow, bright 

 orange, and sometimes almost red, more or less suffused, 

 and frequently with a white zone just within the circum- 

 ference. 



Apothecia often crowded at the centre ; disc plane, darker than 

 the thallus, with a pale entire or slightly crenulated border, 

 which sometimes becomes obsolete. Parnphyses lying in 

 most abundant gelatinous matter, slender or stoutish, 

 articulated, upper cells hardly dilated, apical cell •oo2--oo4 

 mm. broad. Spores swelling in the middle, spherical, sub- 

 spherical, or subquadrangular, •oo8-'oi2 mm. long, •ooy-'oio 

 mm. broad. 



Spei'inogonia scattered, more or less prominent, orange or dark 

 brown. Spermatia on arthrosterigmata, straight, 'oo4-'oo5 

 mm. long, •ooo6--ooo8 mm. broad. 



12. ^Lecanora sympagea (Ach., Prod., p. 105, a.d. 1798); Nyl., 

 Flora, 1883, p. 197. Physcia aurantia (Pers.), Arnold, 

 Lich. Fr. Jura, p. 80. Placodium murorum Leight., Lich. 

 Flora, 3rd ed., p. 160, pro parte. P. callopismum v. plicatum 

 and V. syinpageum Leight., op. cit., p. 162. 



Exs. — Hepp., 197; Zw., 58; Leight., 113; Nyl, 119; 

 Mass., 58, 93, 94, 95; Mudd, 94, 96; Anz., 134, 444a; 

 Arn., 381. 



Thallus closely adnate, rimoso-areolate or imbricato-squamulose 

 in the centre, plicato-lobate or lobato-laciniate at the circum- 

 ference ; lobes radiating, contiguous subimbricate or sub- 

 discrete, varying in breadth, more or less convex, smooth 

 and naked or suffused, becoming broader anteriorly and 

 sometimes flattened, multifid, apices incurved and sub- 

 crenate, bright yellow or dark orange coloured, sometimes 

 white at the centre. 



Apothecia crowded or scattered, disc concolorous or rather 

 darker than the thallus; at first plane with an entire border, 

 afterwards convex with the border obsolete. Paraphyses 

 conglutinated, stout, articulate, apical cells slightly swollen. 

 Spores swollen in the middle, •oio--oi5 mm. long and 

 oo7-"oii mm. broad. 



Dec. 1887. 



