Silver fern

''Alsophila dealbata'', synonym ''Cyathea dealbata'', commonly known as the silver fern or silver tree-fern, or as ponga /ˈpɒŋə/ or punga /ˈpʌŋə/ , is a species of medium-sized tree fern, endemic to New Zealand. The fern is usually recognisable by the silver-white colour of the under-surface of mature fronds. It is a symbol commonly associated with the country both overseas and by New Zealanders themselves.