
The Loxsomataceae are a family of ferns in the order Cyatheales. It comprises two extant genera, Loxsoma (often misspelt as Loxoma) and Loxsomopsis. It has leaves that can be as long as 5 meters long. Extant species in this family are found in New Zealand, Costa Rica, and South America. Fossil species in this family, dating from as early as the Ju...
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http://en.wikipedia.org/wiki/Loxsomataceae

(from the article `fern`) ...numerous subgenera or splinter genera are maintained by some authorities, resulting in a number of genera from 2 to 35; there are 500 ...
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http://www.britannica.com/eb/a-z/l/79
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