This beautiful fern is an Iberian-Macaronesian endemic species living in all the islands of Macaronesia: Canary Islands, Azores, Madeira and Cape Verde and in the region of Algeciras in the Cadiz province, including in the Natural Park of Los Alcornocales, which persists a habitat similar to the laurel forest, warm and humid throughout the year. Belongs to the family of Athyriaceae and its genome contains 82 chromosomes (2n = 82, n = 41). It is a relic of the Miocene, like other Iberan-Macaronesian or African-Iberian-Macaronesian ferns, such as Woodwardia radicans, Culcita macrocarpa, Asplenium hemionitis, Davallia canariensis, etc.. During the Tertiary these ferns filled the greater part of the Mediterranean.
In this picture we can see the long thin caudate or acuminate apex of the pinnae, detail for which was given the name "caudatum". (Double click on the photo to enlarge)