Mr. Turner's Descriptions of Eight Ken) British Lichens. 1 47 



bido, margine lobato, lobis dilatatis brevibus niultifidis ; seu- 

 tellis atro-lividis, margine intlexo albo. 



Tab. XIII. Fig. 1. 



On trees, and roofs, in Sussex, not uncommon. Mr. Barter. 

 About Tunbridge "Weils, and Southampton. 



Alga arborea, foliacea, orbicularis, diametro bipollicaris. 



Thallus arboribus arete appressus, centrum versus rndivisus, et 

 sorediis copiosissime erumpentibus pulvere albo ubique con- 

 spersus, nee raro obtectus, ambitu foliaceus, lobis perquam bre- 

 vibus, planis, dilatatis, multifidis, obtusis, vix, aut ne vix, iin- 

 bricatis, rugulosis, madefactis pari tor ac eisiccatis super sub- 

 terque albidie. 



Scutellce nequaquam frequentes, thalli circa medium ortae, or- 

 biculares, primum concavre, et margine sub-clausa3, mox apcrtn?, 

 et planiusculae ; discus madef actus atro-lividus, pruinosus, exsic- 

 catus in adultis ater; mar go crustse concolor, tenuis, inrlexus, 

 crenulatus. 



It is now many years since I received specimens of this very 

 beautiful Lichen, collected upon the bark of the Olea earopeca, near 

 Cadiz, by my friend Don Simon de Roxas CI em en te, a most 

 acute Spanish botanist, in honour of whom I have named it. 

 Dr. Acharius has also received it from Prance; and the only places 

 where it has yet been discovered in Britain being three of the 

 most southern counties, it may fairly be presumed to be a native 

 of the warmer climates; so conspicuous a species not being likely 

 to be overlooked. It is onlv from the younger and barren 

 plants, and especially from those which grow on flat smooth 

 tiles, that any adequate idea of its elegance can be formed, 

 the frond being in all other cireumstances disfigured by the 



u 2 powder 



