Psilotum (Psilotaceae-Ophioglossales): a taxonomic assessment based on morpho-anatomical studies of the species from the Neotropics. - Tejero-Díez, J. Daniel; Grego-Valencia, Dalia; Prado, Jefferson; Aguilar-Rodríguez, Silvia; Terrazas, Teresa (Brittonia, 2024)