Browsing items filed under: Fern × Partial Shade × Full Shade × Free Draining/Volcanic × Moist/damp × Blechnum discolour Crown fern. Piupiu. Found throughout NZ usually in drier forests Cyathea dealbata Ponga, silver fern Well known symbol of NZ, grows in forests throughout NZ. Cyathea medullaris Mamaku, black ponga Tallest of the tree ferns Todea barbara Found on off-shore islands and north of Bay of Islands. Attractive fern unfortunately becoming very rare due to forestry and development. Tolerates quite dry conditions.