Cyathea dealbata

Silver fern
Frond, showing silver underside
Scientific classification
Kingdom:	Plantae
Division:	Pteridophyta
Class:	Pteridopsida
Order:	Cyatheales
Family:	Cyatheaceae
Genus:	Cyathea
Subgenus:	Cyathea
Section:	Alsophila
Species:	C. dealbata
Binomial name
Cyathea dealbata (G. Forster) Swartz, 1801
Synonyms
Polypodium dealbatum G. Forster, 1786 Cyathea tricolor Colenso, 1883 Alsophila tricolor (Colenso) Tryon, 1970

Cyathea dealbata, also known as the silver tree fern or silver fern, also as ponga /ˈpɒŋə/ or punga /ˈpʌŋə/ (from Māori kaponga or ponga), is a species of medium-sized tree fern, endemic to New Zealand.^[2] It is a symbol commonly associated with the country both overseas and by New Zealanders themselves.^[1]

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.^[3]

Arriving relatively late in New Zealand's history during the Pliocene epoch^[4] (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.

In culture

• The silver fern has long been used on dairy products and was trademarked as early as 1885.
• It is a logo for many other organisations, such as (heavily stylised) the rail operator KiwiRail. The Silver Fern is also the name of a class of railcar.
• Silver fern leaves appear on the coat of arms of New Zealand.
• Many New Zealanders get a tattoo of a Silver Fern, as a statement of being from New Zealand.^{[citation needed]}
• Some alternative flags for New Zealand, such as the silver fern flag, use the silver fern.
• The silver fern is also used extensively within politics and printed material, such as the logo of the former New Zealand Progressive Party.
• The koru symbol is inspired shape of an unfurling silver fern frond. It found extensively in Māori art, and is used in a stylised form as the logo for national airline Air New Zealand.

In short, the fern has become one of the most widely recognised symbols of New Zealand, next to the Kiwi, though it is not an official symbol.^[1]

The silver fern flag has become an iconic, if unofficial, symbol of New Zealand.^[1]

Use in sport

The silver fern is widely used as a symbol by New Zealand national sports teams in various stylised forms. "Silver Ferns" is the name of the national netball team, and most other national women's sports teams have nicknames based on the term "Ferns", such as Black Ferns (women's rugby union), Tall Ferns (women's basketball) and Football Ferns (women's association football).

National sport teams using the silver fern include:

Controversy

• In 1991, the NZRFU obtained trade marks for the name “All Blacks” and its own stylised fern, however on this occasion the scope of the application was broader because they sought to register any 'fern'. In 2005, after a legal case lasting 4 years, the Rugby Board failed in its bid to stop anyone else using any fern logo on any black jersey.
• In 2009 the International Rugby Board tried to stop volunteers from wearing a silver fern at the Rugby World Cup, as they believe the emblem belongs only to the All Blacks.

References

Koru or unfurling frond of Silver fern

External links

• Media related to Cyathea dealbata at Wikimedia Commons
• The International Plant Names Index: Cyathea dealbata