Dicksonia

From Academic Kids

Dicksonia
Scientific classification
Kingdom:Plantae
Division:Pteridophyta
Class:Pteridopsida
Order:Cyatheales
Family:Dicksoniaceae
Genus:Dicksonia
Species

See text

Dicksonia is a genus of tree ferns in the order Cyatheales. It is regarded as related to Cyathea, but is considered more primitive, dating back at least to the Jurassic and Cretaceous periods. The fossil record includes stems, pinnules, and spores.

The genus contains 20-25 species, distributed from Mexico to Uruguay and Chile, St. Helena, New Zealand, Australia, Tasmania, Indonesia, New Guinea, and the Philippines. New Guinea has the greatest diversity, with five species.

The most widely cultivated species of Dicksonia is the Tasmanian Tree Fern (D. antarctica).

The genus was first described by Charles-Louis L'Heritier de Brutelle in 1788. The name honors James Dickson, a prominent nurseryman and botanist.

Species

  • Dicksonia antarctica, Tasmanian Tree Fern, Soft Tree Fern. Australia, Tasmania.
  • Dicksonia archboldii. New Guinea.
  • Dicksonia arborescens. St. Helena.
  • Dicksonia baudouini. New Caledonia.
  • Dicksonia berteriana. Juan Fernandez Islands.
  • Dicksonia brackenridgei. Fiji, Samoa.
  • Dicksonia blumei. Indonesia, Philippines.
  • Dicksonia externa. Juan Fernandez Islands.
  • Dicksonia fibrosa, Woolly Tree Fern, Kuripaka or Wheki-ponga (in Maori). New Zealand.
  • Dicksonia grandis. New Guinea.
  • Dicksonia heironymi. New Guinea.
  • Dicksonia lanata, Tuokuro. New Zealand.
  • Dicksonia lanigera. New Guinea.
  • Dicksonia mollis. Indonesia.
  • Dicksonia sciurus. New Guinea.
  • Dicksonia sellowiana. Southern Mexico through Central America and Northern South America to Bolivia and Uruguay.
  • Dicksonia squarrosa, New Zealand Tree Fern, Slender Tree Fern, Rough Tree Fern, Wheki. New Zealand.
  • Dicksonia stuebelii. Northern Peru.
  • Dicksonia thyrsopteroides. New Caledonia.
  • Dicksonia youngiae, Bristly Tree Fern. Australia.

References

  • Braggins, John E. and Large, Mark F. Tree Ferns. Timber Press, Inc. (2004).
  • Lobin, Wolfram. List of the American Dicksonia Species. Scientific Authority of Germany, Bonn 2001.


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