CRYPTOGAMIA ALGtE. 1003 



nigra 8. BYSSUS filamentis ramofis rigidis atris faxis ad- 

 nafcens. Hudf. Ang. 487. BYSSUS antiqui- 

 tatis? Syjt. nat. edit. 13. fag, 819. Sp, 

 pi. 1638. 

 Black Rock Byflas. Anglis. 

 • :- , Upon the micaceous rocks on the highland moun- 

 tains frequent, as on Ben-Lomond^ Goatfield^ in 

 Arran^ &c. 

 . ; ; ;' It confifts of fine branched black hairs, about a 

 ;; > line in length, clofely matted together, and at 

 :■ fome feafons Iprinkled over with a black pow- 



der. On moift rocks the hairs are longer, and 

 feel foft and downy ; on dry ones, they are 

 extremely fhort and rigid, fcarcely vifible to 

 the naked eye •, and grow together fo as to form 

 a hard brittle crufl:. 

 , I fufpeft the B. antiquitatis Lin. to be the fame 



with the above •, for in the lafl: edition of the 

 - ' Syjtema Naturae, that author feems to allow it to 



.;■ .. r belong to the filormis divifion of this genus. 

 And the black powder with which our kind is 

 ,, -' fometimes invelted might have firft induced 



him to place it amongll the farinaceous fpe- 

 cies. 



Candida 9. BYSSUS filamentis ramofifllmis, ramis fafcicu- 



latis albidis. Hudf. Angl. 488. n. 8. {Raii 



4 Synopf, 



