34 NEW BRITISH LICHENS. 



Lecidea pammicta. /S/j-ft. — Thallus (K e flavo ferrugineo- 

 riibeiis), albidus vel cinereo-albidus crassus, areolate-difFractus, 

 areolis laivibus minute papillosis ; apotbecia nigra achiata plana 

 vel convexiuscula, margine undulato interdum pallidiore ciiicta, 

 epithecio sajpissime gyroso-plicato, intus pallida ; spora3 8naj, 

 incolores simplices ellipsoidege, -OOS-'Ol X -OOS-'OOG m.m. ; 

 paraphyses crassaj irregulares indistinctaj apicibus clavatis nigri- 

 cantibus ; hypotbecium incoloi'. Gel. hym., iodo coerulescens deiii 

 violascens. 



Ad saxa, Ben Artbur. 



Tliallns (K yellow, tben orange red) wbitisb or cinereo-albes- 

 cent, tbick, areolato-diffract, areolae smooth, minutely papillose ; 

 apotbecia black, sessile plane, or somewbat convex witb an undu- 

 lated, at times paler margin, pale within ; epithecium almost con- 

 stantly gyroso -plicate ; spores 8, colourless, simple elliptical, 

 rather small ; paraphyses thick, not distinct with clavate nigricant 

 apices; hypotbecium c. lourless. Hymeneal gelatine blue, then 

 violet with iodine. 



This lichen partakes of the characters of L. mollis (Whlnb.) 

 and L. tessellata (Flk.). 



Iiecidea scutulata. <S<rw.— Thallus (K — C — ) pallide cervinus 

 vel pallide infescens tennuisculus diffracto-areolatus, areolis planis 

 vel nonnibil convexis ; apotbecia mediocria vel majuscula fusco- 

 nigra vel nigra innata vel interdum paulo emersa, tenuiter mar- 

 ginata, epithccia concavo ; sporte 8nse, simplices incolores 

 ellipsoideee, •024--032 x "01 2- -015 m.m. ; paraphyses crebr« 

 graciles apicibus fuscercentibus ; hypothecfum crassum fusco- 

 nigrum. Gel. hym. iodo coerulescens dein pars media viuose 

 fulvercens, apicibus persistenter coerulee tinctis. 



Ad saxa apud, Ben Lawers. 



Tballus (K — C — ) pale cervino-rufescent thinnish diffracto- 

 areolate, areolae, somewbat convex ; apotbecia rather large, fdsco- 

 nigricant or black, innate, or a little elevated, thinly marginate ; 

 epithecium concave ; spores 8, simple, colourless, ellijjtical, large ; 

 paraphyses numerous filiform, apices, fuscescent ; hypotbecium 

 tbick, fusco-nigrous. Gel. hym. coerulescent, then the middle of 

 the hymenium vinoso-fulvescent, the upper extremity remaining 

 coerulescent with iodine. 



This is closely allied to L. pansaeola (Ach.), but the reactions are 

 constantly as indicated above. None of the reddish cejibalodia, 

 usually present on the latter, have been seen on any of the speci- 

 mens. 



Iiecidea callista. Strn. — Tballus fusco-niger granulosis grauulie 

 dispersis vel conglomeratis ; apotbecia conferta Siepissime contigua 

 parva nigra adnata ca^sio-pruinosa, margine prouiinulo inflexo 

 cincta ; sporte 8n£e simplices incolores elougato-ellipsoidese vel 

 cylindracete, •012--014 X '003 m.m., forsan non bene evoluta-o; 



