CRYPTOGAMIA ALGi^. Hi^ 



a grcenifh farinaceous powder, but no Ihields. 

 This fpecies is therefore dioecious. 

 p. The fhields grow on feparate crults, of no regular 

 figure, nor diftinguiOied by thofc lobed leaf- 

 like margins above-mentioned. They are very 

 fmall, numerous, and crowded, either ©f «- 

 greenifh grey, or lead-color'd, with white rims. 

 This is fuppofed to be the female kind by Diiler 

 mus, and the male by Micheii and Linnaus. 



fuhfufcusi'i L. cruftaceus albicans, fcutellis ^ubfufcis, mar- 

 gine cinereo fubcrenato. .5^;. pi. ibo^. {Dillen, 

 mufc. t. i2.f. 16. J.B) 



Brownifh Lichen. Jn^Us. 



On trunks of trees and walls common. 



The crufl- of this is grey or whitifh, thin,, and 

 fmoother when on trees -, thicker and rougher 

 when on walls or rocks. The fhields are fmall 

 and numerous, of a brownidi colour, fur- 

 rounded by whit.fh rims, generally a little cre- 

 nated on their edges. The difc of the fhield 

 fometimes fwells and becomes convex, refem- 

 bling a tubercle, but is flill encircled hy the 

 white margin. When the fhields grow old, th-? 

 fubftance of the difc often drops out. 



Bttr 24. L. cruftaceus albicans, fcutellis nlgris albo margi- 

 natis. Hudf Bl- Jng, 445. an L, dnsreus ? Lin. 

 Syji. nat, 13 edit. p. So^. fed fcute.'Ia /tint, non tu- 

 bercula, (Dillen- mufc, /. 18./. 15. C^ /. ^5, /. 8. 

 4dkafi»,) 



Black 



