CRYFTOGAMIA ALGJE. 1003 



nigra 8. BYSSUS filamentis ramofis rigidis atris faxis ad- 

 nafcens. Hudf. Ang. 487. BYSSUS antiqui- 

 tat is? Syjl, mt. edit. 13. pag. 819. Sp, 

 pi 1638. 



Black Rock ByfTus. Anglis. 



Upon the micaceous rocks on the highland moun- 

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

 Arran, &c. 



It confifts of fine branched black hairs, about a 

 line in length, clofely matted together, and at 

 fome feafons fprinkled over with a black pow- 

 der. On miOift 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 cruft. 



I fufpecTt the B. antiquitatis Lin. to be the fame 

 with the above ; for in the laft edition of the 

 Syjiema Nature, that author feems to allow it to 

 belong to the fibrous divifion of this genus. 

 And the black powder with which our kind is 

 fometimes invefted might have firft induced 

 him to place it amongft the farinaceous fpe- 

 cies. 



Candida 9. BYSSUS filamentis ramofiflimis, ramis fafcicu- 

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



Synopf. 



