60 BRITISH FERNS. 
‘great rarity; a very few roots have been found on 
Slieve Bignian, in the County Down; a few others 
within the liberties of Carrickfergus, in the. County 
Antrim; and a single root on Carlingford Mountain, 
in the County Louth. 
Tn cultivation, it grows best in peaty bog earth, 
without any admixture of loam, and great care should 
be taken that no water stands about the roots, as this 
is sure to prove fatal. , 
6. POLYPODY. Potypoprux VULGARE. 
Polypodium vulgare, Linneus. _B. F. 41, 48, 45, 
‘and entirely covered with a dense, brown, pilose 
pendant when mature. The stalk is green, and is 
