''Ctenitis squamigera'', commonly known as the Pacific lacefern or ''pauoa'', is a critically endangered species of

fern The ferns (Polypodiopsida or Polypodiophyta) are a group of vascular plants (plants with xylem and phloem) that reproduce via spores and have neither seeds nor flowers. They differ from mosses by being vascular, i.e., having specialized tissue ...

found only on the islands of

Hawaii Hawaii ( ; ) is an island U.S. state, state of the United States, in the Pacific Ocean about southwest of the U.S. mainland. One of the two Non-contiguous United States, non-contiguous U.S. states (along with Alaska), it is the only sta ...

.Bruegmann, M. M. & V. Caraway. (2003)
''Ctenitis squamigera''

IUCN Red List of Threatened Species The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is an inventory of the global conservation status and extinction risk of biological spe ...

. IUCN 2010
www.iucnredlist.org
. Retrieved on 23 February 2011. In 2003 there were at least 183 individuals remaining, divided among 23 populations.USFWS
''Ctenitis squamigera'' Five-year Review.
July 2009. Several populations consist of only one to four plants. Threats to the species include the degradation of the Hawaiian forests by

Axis deer The chital or cheetal (''Axis axis''; ), also called spotted deer, chital deer and axis deer, is a deer species native to the Indian subcontinent. It was first described by Johann Christian Polycarp Erxleben in 1777. A moderate-sized deer, male ...

Mouflon sheep The mouflon (''Ovis gmelini'') is a wild sheep native to Cyprus, and the Caspian region, including eastern Turkey, Armenia, Azerbaijan, Georgia and Iran. It is also found in parts of Europe. It is thought to be the ancestor of all modern domestic ...

feral pig A feral pig is a domestic pig The pig (''Sus domesticus''), also called swine (: swine) or hog, is an omnivorous, domesticated, even-toed, hoofed mammal. It is named the domestic pig when distinguishing it from other members of the g ...

s and

goat The goat or domestic goat (''Capra hircus'') is a species of Caprinae, goat-antelope that is mostly kept as livestock. It was domesticated from the wild goat (''C. aegagrus'') of Southwest Asia and Eastern Europe. The goat is a member of the ...

s, and

invasive plant species An invasive species is an introduced species that harms its new environment. Invasive species adversely affect habitats and bioregions, causing ecological, environmental, and/or economic damage. The term can also be used for native species ...

such as Santa Barbara daisy and

guava Guava ( ), also known as the 'guava-pear', is a common tropical fruit cultivated in many tropical and subtropical regions. The common guava '' Psidium guajava'' (lemon guava, apple guava) is a small tree in the myrtle family (Myrtaceae), nativ ...

. This fern is a federally listed

endangered species An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching, inv ...

of the United States.

References

External links

USDA Plants Profile
Dryopteridaceae Endemic flora of Hawaii Native ferns of Hawaii Critically endangered flora of the United States {{Dryopteridaceae-stub