Asplenium chihuahuense

Asplenium chihuahuense is a rare fern endemic to the states of Chihuahua and Durango, Mexico.

Asplenium chihuahuense
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Division:	Polypodiophyta
Class:	Polypodiopsida
Order:	Polypodiales
Suborder:	Aspleniineae
Family:	Aspleniaceae
Genus:	Asplenium
Species:	A. chihuahuense
Binomial name
Asplenium chihuahuense Baker
Synonyms[1]
A. dubiosum Davenp.

Formally described in 1891, it is very similar to Asplenium adiantum-nigrum, which is occasionally found in the adjacent portions of the United States, and has sometimes been placed in synonymy with that species. However, experiments published in 1994 showed that A. chihuahuense is a fertile allohexaploid hybrid between A. adiantum-nigrum and an unknown diploid species.