864 CRYPTOGAMIA ALG/E. 



itiargins, and fpreading in a circle or duller of 

 about the fize of a fixpence. They are or a 

 black brov/n or dufky lad colour, very thin and 

 britUe, and quite Imooth on both fides. 



Ko fru6lificatloriC. of any kind have as yet beeri 

 obfcrvcd upun them. 



The leaves when moid are of a black green co- 

 lour. 



pohrbiz:js L- umbilicatus polyphyllus fnpernc glabrum, in- 



"i, lernc nigrum & cirrohim. l^, polyrhizos. Lin.Sp. 



pi. 1 61 8- dijjeriniia Jpecif.ca emendata. (Haller. 



bijf. hehel. n. 2000. /. 47. /. 4, Dillen. mufc. t. 



30. /. I 30, hona.) 



Dulky rock Lichen, black and fibrous under- 

 neatli. Anglis. 



Upon the rocks on the highland mountains no!* 

 unfrcquent. Tht iame alfo was communicated 

 to me by by Dr. Burgefs^ found upon the rock? 

 in the lowlands. 



This confifls fometimcs of one finuated leaf only^ 

 but more comnionly of leveral^ united together 

 by an umbilical cord at the bafe, and fpreading 

 10 the breadth of a fliilling or half a crown. 

 The upper fide is fmooth, of a dufl^y browii 

 or fad colour when old and dry, but when frelh' 

 of a whiiiih or cinereous brown. The under 

 tide is quite bktck, rough and fibrou-s. 



But 



