“…Ferns and related plants are a widely distributed plant group and several species are used in traditional medicine for respiratory and intestinal diseases, among others [ 3 , 4 , 5 ]. Studies in recent years report in this group a diversity of compounds such as alkaloids, diterpenes, triterpenes, flavonoids, polyphenols and steroids that represent a potential bioactivity, especially in species of the families Huperziaceae, Blechnaceae, Pteridaceae, Dryopteridaceae, Thelypteridaceae, Polypodiaceae, Aspleniaceae, Gleicheniaceae, Dicksoniaceae, Davalliaceae and others [ 6 , 7 , 8 ]. Ferns of the genus Blechnum L. are widely distributed worldwide and are a promising source of bioactive compounds (phenolic acids, lignans, flavonols, flavones, anthocyanidins, sesquiterpene, diterpenes, sterols, fatty acids, alcohols, aldehydes, carotenoids and heterocyclic) with antipyretic, analgesic, anti-inflammatory, antimicrobial and antioxidant properties [ 9 , 10 , 11 ].…”