Elaphoglossum dimorphumElaphoglossum dimorphum, the toothed tongue-fern, is a herbaceous plant, a member of the Dryopteridaceae family.DistributionIt is an endemic species to St. Helena.TaxonomyIt was named by Joseph Dalton Hooker and Robert Kaye Greville, in Moore. In: Ind. Fil. 8. in 1857.