The Members of the Ray Society are respectfully 

 solicited to aid the author of this work in his endeavours 

 to clear up some doubtful points, by communicating for 

 examination specimens of the following Lichens. Such 

 specimens as may be transmitted to him, addressed Rev. 

 W. A. Leigh ton, Luciefelde, Shrewsbury, shall be taken 

 care of, and speedily and safely returned with thanks. 



Endocarpon Isetevirens, Turn. 



sulphurcum, Tayl. 



rugosum, Tayl. 

 Parmelia badia, Fries. 



-r- cervina, Fries. 

 Verrucaria byssacea, Tayl. 



alba, Schrad. 



muralis, Ach. 



rubiginosa, Tayl. 



rupcstris, Schrad. 



Gagei, Borr. 



Harrimanni, Ach. 



The author has entered upon a similar investigation 

 in the genera Umbilicaria, Opegrapha, Graphis, Leca- 

 nactis, Platygramme, Arthonia, Spiloma, Calicium, and 

 Oollema, specimens, even of the commonest species, will 

 therefore be useful and acceptable. 



