WordNet (r) 3.0 (2006):

Polypodium vulgare
    n 1: mat-forming lithophytic or terrestrial fern with creeping
         rootstocks and large pinnatifid fronds found throughout
         North America and Europe and Africa and east Asia [syn:
         common polypody, adder's fern, wall fern, golden
         maidenhair, golden polypody, sweet fern, Polypodium
         vulgare]