Browsing items filed under: Full Shade × Requires Shelter × Free Draining/Volcanic × Heavy Clay Loam × Moist/damp × Blechnum discolour Crown fern. Piupiu. Found throughout NZ usually in drier forests Cyathea medullaris Mamaku, black ponga Tallest of the tree ferns Rhopalostylis baueri var cheesemanii Kermadec nikau The Kermadec nikau has longer fronds, larger flower heads and darker seeds than the mainland nikau.