Mr. Turner's Descriptions of Eight New British Lichens. 145 



P. albella by its minute clustered shields, never dilating, as in 

 that species, by their thick not elevated margin, and by the 

 colour of their disk, which, however, is not discernible except 

 the plant is injured. From P. parella it also differs in the size 

 of the shields, and their never spreading, as well as the thick- 

 ness of the margin, and its not rising above the disk. 



Parhelia carneo-lutea. 





P. crust& membranacea tenuissim& effusd alb&; scutellis sub-im- 

 mersis planiusculis luteis, junioribus margine involvente lacero 

 fere clausis. 



Tab. XII. Fig. 2. 



On the bark of old elms about Lewes, iUbourne, Steyning, 

 Southwick, and Hastings in Sussex. Mr. Borrer. 



i 



Alga arborea, Crustacea, late et absque ullo ordine effusa. 



Crusta tenuissima, ut oculo inermi tantum macula alba ap- 

 pareat, sequalis, laevigata, continua, madefacta, aeque ac sicca, 

 alba, nitida. 



Scutellcc frequentes, nee rar6 conglomerate, orbiculares, per- 

 quam exiguae, sub-immersae, disco planiusculo, in vetustis con- 

 vexo, margine crustse concolore, elevato, scutellas juniores in- 

 volvente, et propemodum claudente, mox lacero, et aetate, ut 

 videtur, detrito, et crenulato ; disci madefacti color pallide lu- 

 teus, exsiccati corneus. 



Substantia membranacea. 



The crust of this Lichen is so exceedingly thin, that its ap- 

 pearance at first sight is nothing more than that of an unusually 

 vol. ix. u bare 



