The Collaborative International Dictionary of English v.0.48:

leatherleaf \leatherleaf\ n.
   1. A stiff leathery-leaved fern (Polypodium scouleri) of
      Western North America having ovate fronds parted to the
      midrib.

   Syn: leathery polypody, coast polypody, Polypodium
        scouleri.
        [WordNet 1.5]

   2. A northern temperate bog shrub (Chamaedaphne calyculata)
      with evergreen leathery leaves and small white cylindrical
      flowers.

   Syn: Chamaedaphne calyculata.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Polypodium scouleri
    n 1: stiff leathery-leaved fern of western North America having
         ovate fronds parted to the midrib [syn: leatherleaf,
         leathery polypody, coast polypody, Polypodium
         scouleri]