2010 Zoya Akulova   cc-by-nc

Woodwardia (Chainfern) is a genus of herb in the family blechnoids. This genus is extinct. They are native to Canada and The Contiguous United States. Individuals could grow to 19 m. They have alternation of generations.

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  • URI: http://eol.org/schema/terms/extinct
  • Definition: A taxon is Extinct when there is no reasonable doubt that the last individual has died. A \r\ntaxon is presumed Extinct when exhaustive surveys in known and/or expected habitat, \r\nat appropriate times (diurnal, seasonal, annual), throughout its historic range have failed \r\nto record an individual. Surveys should be over a time frame appropriate to the taxon’s life cycle and life form.
  • Attribution: http://www.iucnredlist.org/technical-documents/categories-and-criteria
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EOL has data for 16 attributes, including:

Known occurrences, collected specimens and observations of chainfern. View this species on GBIF