Camplyoneurum xalapense is a species of fern in the family Polypodiaceae. It is apparently found only within Central America, especially in southern Mexico and Guatemala.
References
Polypodium xalapense (Fée) Christ, Bull. Soc. Roy. Bot. Belgique. 35(1): 231. 1896. Timothy Plowman, Five new species of Brunfelsia from South America (Solanaceae), Fieldiana. Botany: New Series Volume 8; Pub. no.1322. Field Museum, Chicago, IL, 1981.