Silver fern

Alsophila tricolor, synonym Cyathea dealbata, commonly known as the silver fern or silver tree-fern, or as ponga /ˈpɒŋə/ or punga /ˈpʌŋə/ (from Māori kaponga or ponga), 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.

Alsophila tricolor is the correct name for Cyathea dealbata in Alsophila because the epithet dealbata is preoccupied by Alsophila dealbata C.Presl (now a synonym of Sphaeropteris glauca).