CRYPTOGAMIA ALG-S:. 



1005 



in his Synopfts. pag. 25. ;/. 27. under the name 

 of Oak-Leather^ growing in the crevices of 

 decay'd wood. Of this lad kind we have {^zn 

 fpecimens, differing from thefirft only in being 

 much thicker, tougher, and of a buff color, 

 not unlike a piece of buck-fkin leather. 



This, Mr. Ray informs us, the common people 

 in Ireland and elfewhere make ufe of to heal 

 wounds and ulcers, either firft fpreading falve 

 upon it, or tMt fimply laying it upon the part 

 affefted. 



** Puherulentic. 



BYSSUS pulverulenta cinerea rupes operiens. 

 Sp.pl. 1638. (Fig. nulla.) 



Crey Rock Byflus. Anglis. 



Upon rocks that have been long expos'd to the 

 weather, frequent. 



This is nothing but a grey farinaceous powder 

 which covers the rocks, particularly fuch as 

 are calcarious, and that fometimes in fuch 

 quantities as to form a friable cruft, a line in 

 thicknefs, whitilh when broken. 



BYSSUS pulverulenta flava lignis adnafcens. Sp. 



pi 1639. {Billen. mufc, 3. /. i./. 4.) 

 Yellow Powder ByiTus. Anglis. 

 Upon old pales, and the bark of trees between 



the 



