title: [New species of Dennstaedtia (Filicales: Dennstaedtiaceae) to Mexico].
abstract: Dennstaedtia gracilis A. Rojas et Tejero (Dennstaedtiaceae) is herein described and illustrated as a new species endemic to Mexico. Its belongs to the group of winged adaxial secondary costae species but it differs by the combination of characters as smaller fronds, deltate pinnules and lobed segment apex.
authors.affiliation: Universidad Autónoma Metropolitana, División de Ciencias Biológicas y de la Salud, Coordinación de docencia y atención a alumnos, Av. Michoacán y La Purísima s.n., Col. Vicentina, 09340, México, D.F. arojas@xanum.uam.mx
authors.forename: Alexander Fco
authors.initials: AF
authors.lastname: Rojas-Alvarado
authors.forename: J Daniel
authors.initials: JD
authors.lastname: Tejero-Díez
mesh_terms: D032497:Dennstaedtiaceae / Q000033:anatomy & histology / Q000145:classification*; D008800:Mexico