''Amauropelta inabonensis'',

synonym A synonym is a word, morpheme, or phrase that means exactly or nearly the same as another word, morpheme, or phrase in a given language. For example, in the English language, the words ''begin'', ''start'', ''commence'', and ''initiate'' are all ...

''Thelypteris inabonensis'', is a rare species of

fern A fern (Polypodiopsida or Polypodiophyta ) is a member of a group of vascular plants (plants with xylem and phloem) that reproduce via spores and have neither seeds nor flowers. The polypodiophytes include all living pteridophytes except t ...

known by the common name cordillera maiden fern.''Thelypteris inabonensis''.
USDA Plants Profile. It is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

Puerto Rico Puerto Rico (; abbreviated PR; tnq, Boriken, ''Borinquen''), officially the Commonwealth of Puerto Rico ( es, link=yes, Estado Libre Asociado de Puerto Rico, lit=Free Associated State of Puerto Rico), is a Caribbean island and Unincorporated ...

, where it is known from only two localities: at the headwaters of

Río Inabón Río Inabón is one of one of the 14 rivers in the municipality of Ponce, Puerto Rico. With a length of some , it is Ponce's second longest river after Río Jacaguas. It is fed by the Río Anón, Río Guayo (which itself is fed by the Chiqu ...

and at the

Toro Negro State Forest Toro Negro State Forest (Spanish: ''Bosque Estatal de Toro Negro'') is one of the 21 forests that make up the public forests system in Puerto Rico. It is also Puerto Rico's highest cloud forest. It is in the Cordillera Central region of the is ...

. It 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 and inv ...

of the United States. This fern was first described in 1985.Proctor, G. R. (1985)
New species of ''Thelypteris'' from Puerto Rico.
''American Fern Journal'' 75(2) 56-70. It was placed on the endangered species list in 1993.USFWS
Determination of endangered status for three endemic Puerto Rican ferns.
''Federal Register'' July 2, 1993. At that time it was known to exist at two locations in the mountain forests of Puerto Rico, one near the Río Inabón in the

Toro Negro Commonwealth Forest Toro Negro State Forest (Spanish: ''Bosque Estatal de Toro Negro'') is one of the 21 forests that make up the public forests system in Puerto Rico. It is also Puerto Rico's highest cloud forest. It is in the Cordillera Central region of the isl ...

and one on

Cerro Rosa Cerro Rosa is the third highest peak of Puerto Rico measuring above sea level. The mountain is located in the Cordillera Central, on the border between the municipalities of Ciales and Jayuya Jayuya (, ) is a town and municipality of Puerto ...

Ciales Ciales (, ) is a town and municipality of Puerto Rico, located on the Central Mountain Range, northwest of Orocovis; south of Florida and Manatí; east of Utuado and Jayuya; and west of Morovis. Ciales is spread over eight barrios and Ciales P ...

(Cerro Rosa is also located in the

''Los Bosque de Puerto Rico.''
PR Department of Natural and Environmental Resources. Hojas de Nuestro Ambiente. Publication P-010. November 2006. Retrieved 18 August 2013.). In total there were about 46 individual plants counted. This terrestrial fern has fronds up to 60 centimeters long divided into 25 or 30 pairs of lightly hairy segments. The sori are arranged around the veins on the undersides. They are covered with hairy

indusia A sorus (pl. sori) is a cluster of sporangia (structures producing and containing spores) in ferns and fungi. A coenosorus (plural coenosori) is a compound sorus composed of multiple, fused sori. Etymology This New Latin word is from Ancient Gr ...

References

Thelypteridaceae Endemic flora of Puerto Rico Plants described in 1985 {{Polypodiales-stub