CRYPTOGAMIA ALG^. «i3 



a grecnilli farinaceous powder, but no fi:ields. 

 This fpecies is therefore dia'cious. 

 p. The fhields grow on feparate crults, of no re'nil.ir 

 figure, nor diftinguifhed by thofe lobed leaf- 

 like margins above-mentioned. They are very 

 fmali, numerous, and crowded, either of a 

 greenilh grey, or lead-color'd, with v>/hire rims. 

 This is fuppofed to be the female kind by Dille- 

 jiius, and the male by Micheli and Linnaeus. 



fuhfufcus7.2) L' cruftaceus albicans, fcutellis A-ibfufis, mar- 

 gine cinereo fubcrenato. Sp. pi. 1609. {Dillcn. 

 mufc. t. iZ.f. \6. J.B ) 



Brownifli Lichen. An^Jis. 



On trunks of trees and walls common. 

 '.; . The cruft 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 brownifli colour, fur- 

 rounded by whitifh rims, generally a little crc- 

 nated on their edges. The difc of the fliield 

 fometimes fwells and becomes convex, refem- 

 bling a tubercle, but is ftill encircled by the 

 white margin. When the fhields grow old, the 

 fubftance of the difc often drops out. 



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

 natis. Hudf. Fl- Ang. 445. an L. cinereus ? Lvu 

 Syji. nat, 13 edit. p. )io^, fed fcutella; junt^ non tu- 

 hsrcuta. (Dillen. mufc. /. 18./. 15. C^ /. ^5. f. '6, 

 ad hafm,) 



Black 



