Cyathea dealbata

Cyathea dealbata, also known as the silver tree-fern or silver 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. It is a symbol commonly associated with the country both overseas and by New Zealanders themselves.

This fern is known to grow to heights of 10 m or more (though it occasionally takes a rare creeping form). The crown is dense, and the fronds tend to be about 4 m long and have a silver-white colouration on the undersides. This distinctive silver colouration has made them useful for laying along tracks for night walking. The scales are a dark brown and are often twisted and glossy.

Arriving relatively late in New Zealand's history during the Pliocene epoch (around 5.0–1.8 million years ago), the silver fern occurs on the main islands of New Zealand and on the Chatham Islands to the east, mostly in the subcanopy areas of drier forests and in open scrub. It is known to grow well in well-drained humus, and once established, it will tolerate drier conditions. It does best when sheltered from winds and should be protected from frost. It does not grow under the dense canopy of mature forests.

Silver Fern (disambiguation)

Silver Fern may refer to:

NZR RM class (Silver Fern)

The NZR RM class Silver Fern is a class of railcar in New Zealand. The three air-conditioned and sound-proofed 723-kW 96-seater diesel-electric twin-set railcars were built by Kawasaki and Toshiba, trading as Nissho Iwai Company of Japan. The New Zealand Railways classed the railcars RM, like all other railcars.

History

The railcars are most famous for their service on the eponymous North Island Main Trunk daylight passenger train between Auckland and Wellington between Sunday 14 December 1972 and Sunday 8 December 1991.

Built by Kawasaki and Toshiba (trading as Nissho Iwai), the Silver Ferns were introduced in 1972 to encourage passengers back to rail transport due to competition from air and road transport. The class was named the "Silver Ferns" (a national symbol of New Zealand) because of their exterior was made of corrugated stainless steel, like the overnight "Silver Star" carriage train, and replaced the three 82-seater Blue Streak railcars.

In December 1991 the Silver Fern was replaced by the Overlander carriage train. The railcars were transferred to two newly introduced services: the Kaimai Express between Auckland and Tauranga and the Geyserland Express between Auckland and Rotorua. In 2000, a third service was added, the Waikato Connection between Auckland and Hamilton. All three services ceased on 7 October 2001.