''Asplenium chihuahuense'' is a rare fern endemic to the states of

Chihuahua Chihuahua may refer to: Places *Chihuahua (state), a Mexican state **Chihuahua (dog), a breed of dog named after the state **Chihuahua cheese, a type of cheese originating in the state **Chihuahua City, the capital city of the state **Chihuahua Mun ...

and

Durango Durango (), officially named Estado Libre y Soberano de Durango ( en, Free and Sovereign State of Durango; Tepehuán: ''Korian''; Nahuatl: ''Tepēhuahcān''), is one of the 31 states which make up the 32 Federal Entities of Mexico, situated in ...

, Mexico. Formally described in 1891, it is very similar to ''

Asplenium adiantum-nigrum ''Asplenium adiantum-nigrum'' is a common species of fern known by the common name black spleenwort. It is found mostly in Africa, Europe, and Eurasia, but is also native to a few locales in Mexico and the United States. Description This splee ...

'', 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.

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Probable type
from JSTOR Global Plants. chihuahuense Ferns of Mexico Plants described in 1891 {{Polypodiales-stub