'CRYPTOGAMIA ALGiE. 1007 



decay'd mofs, and on the trunks of trees in 

 damp fliady places, in the autumn and winter- 

 feafons. 

 It is a whitirii grey friable powder, confiding of 

 fmall fhapelefs particles, for the moft part loofe 

 and incoherent. — After rains, or when damp, 

 it is of a glaucus or blue-grey color. 



la^ea 14. BYSSUS pulverulento cruftacea albifTima. Sp. 



pi. 1639. (Dillen. mufc. 2. /. i./. 2.) 

 ■<,.. - ' White-wafh ByfTus. Anglis. 

 _i\ It covers old Hypnums and Lichens., which grow 



upon rocks and the trunks of trees. 

 It invefts the fubftances upon which it grows 

 with a thin, wide, fmooth, hard, uneven, brit- 

 tle crufi:, making them appear exactly as if 

 they had been white-walh'd. 

 .- At fome feafons, this cruft produces on its fur- 



face unequal lumps or tubercles of a yellowifh 

 or dirty white farinaceous fubftance. 

 Thefe, we apprehend, may be term'd the frud'ti- 

 <,'' fications. 



This fpecies is certainly more nearly related to 



the genus of Lichen than that of Byjfus. But we 



had the pleafure of examining Dillenius's ovvn 



fpecimens, and therefore are confident that our 



- '.: defcription is juftly apply'd. 



FUNGI. 



