smith’s fern. 
131 
SMITH’S FERN, [young fronds of the natural size). 
PoLYPODiUM CALCAREUM, Smith, Hooker, Babington. 
This fern is confined to limestone districts, where it grows in 
exposed situations, among loose stones. In Great Britain it 
must be considered a very local species, and I therefore offer a 
list of all the habitats which have come to my knowledge ; these 
K 2 
