#cyatheadealbata, commonly known as the #silverfern 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 #newzealand. The fern is usually immediately 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. The #koru symbol is inspired by the shape of an unfurling silver fern frond. It is found extensively in Māori art, from carving to the official Māori flag, and is used in a stylised form as the logo for national airline Air New Zealand. Its circular shape conveys the idea of perpetual movement, and its inward coil suggests a return to the point of origin.