Elaphoglossum nervosumElaphoglossum nervosum, the veined tongue-fern, is a herbaceous plant, a member of the Dryopteridaceae family.DescriptionIt is a fern with short, scaly, black, sterile leaves approximately 12-25 cm long.DistributionIt is an endemic species to St. Helena.TaxonomyIt was named by Jean Baptiste Bory de Saint-Vincent,. In: Mon. 50, t. 13. in 1899.