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 Cibotium menziesii
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Calochlaena |
The Dicksoniaceae is a family of tropical, subtropical and warm temperate ferns. A genus (plural genera from Γένος Latin genus "descent family type gender" is a low-level Taxonomic Dicksonia is a genus of Tree ferns in the order Cyatheales It is regarded as related to Cyathea, but is considered more primitive dating Cyathea is a Genus of Tree ferns the type genus of the Fern order Cyatheales. In Biological classification, family ( Latin A fern is any one of a group of about 20000 Species of Plants classified in the phylum or division Pteridophyta, also known as Filicophyta Most of the 5-6 genera in the family are terrestrial ferns or have very short trunks compared to tree ferns of the family Cyatheaceae. A genus (plural genera from Γένος Latin genus "descent family type gender" is a low-level Taxonomic The order Cyatheales is a Taxonomic division of the Fern subclass Cyatheatae, which includes the tree ferns. The Cyatheaceae is a family of Fern that includes the world's tallest Tree ferns which reach heights up to 20 m However, some of the larger species can reach several metres in height. A number of others are epiphytes. An epiphyte is an organism that grows upon or attaches to a living plant They are found mostly in tropical regions in the Southern Hemisphere, as far south as southern New Zealand. The Tropics are centered on the Equator and limited in Latitude by the Tropic of Cancer in the northern hemisphere at approximately 23°26' (23 Southern Hemisphere is the half of a Planet that is South of the Equator —the word hemisphere literally means 'half ball' New Zealand is an Island country in the south-western Pacific Ocean comprising two main landmasses (the North Island and the South Island
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Morphology
Species in the family are generally characterized by large pinnate fronds, 1–4 m long. A frond is a large Leaf with many divisions to it and the term is typically used for the leaves of palms Ferns or Cycads A frond is The family includes several species of tree ferns, which grow a single trunk, notably the species in Dicksonia. Dicksonia is a genus of Tree ferns in the order Cyatheales It is regarded as related to Cyathea, but is considered more primitive dating All members of the family have long, tapering hairs composed of cells arranged end to end, unlike the scales characteristic of the Cyatheaceae.
Evolution
The ferns of family Dicksoniaceae are generally regarded as more primitive than those of the family Cyatheaceae, having originated in the early Jurassic period. The Jurassic is a geologic period and system that extends from about Ma (million years ago to Ma that is from the end of the Triassic to the beginning
Diversity
Only 3 extant genera are recognised in this monophyletic family:
- Calochlaena
- Dicksonia
- Lophosoria
See also
References
- Classification of Ferns and Allies
- Braggins, J. A genus (plural genera from Γένος Latin genus "descent family type gender" is a low-level Taxonomic A clade is a taxonomic group comprising a single Common ancestor and all the descendants of that ancestor Dicksonia is a genus of Tree ferns in the order Cyatheales It is regarded as related to Cyathea, but is considered more primitive dating Cyathea is a Genus of Tree ferns the type genus of the Fern order Cyatheales. The order Cyatheales is a Taxonomic division of the Fern subclass Cyatheatae, which includes the tree ferns. E. and Large, M. F. (2004). Tree Ferns. Timber Press. ISBN 0-88192-630-2
- Smith, A. R. , K. M. Pryer, E. Schuettpelz, P. Korall, H. Schneider & P. G. Wolf 2006. A classification for extant ferns.PDF (420 KiB) Taxonomy 55(3): 705-731. A kibibyte (a contraction of ki lo bi nary byte) is a unit of Information or Computer storage, established by the International
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