APPENDIX. 177 



HELVELLA acaidis Stformis fuBJufcd, margifie varia lobato CCXXVI. 

 crijpato fubtus veno/a, ve \us 1 imojis anoftomofentibus ■, Dick/on mcmbranetia 

 Cry ft. l-'af. r . P. 21. Hclvdla dimidiuta. Builiard lexte, 

 P. 291. No. 3. lb. Agaricus mufcigertus. 



THIN HELVELLA. 



TAB. CLXXVII. 



''p'HIS little delicate plant fboots down, into the moffy foil where 

 -*• it grows, a flender longiih root, turniihed with a few hair- 

 like fibres ; from the head of this root the plant Ipreads horizon- 

 tally, on the furface of the mofs, and has much the appearance 

 of a tramella ; it varies much in ihape, being halved or divided 

 into feveral broad lobes. 



The upper furface is fmooth, and of a dark redifh brown; it 

 is thin and flexible, but rather tough. 



The underfidc is marked with divided and fubdivided veins, 

 which while the plant is young;, give it much the appearance of 

 a fmall dimidiated parafitic Agaric. I have feldom found it on 

 bryums upon old walls ; and I have received the fame from the 

 county of Durham, where, I am informed, it is common on 

 thatched houfes. 



