Ophioglossaceae, from Ancient Greek ὄφις (óphis), meaning "snake", and γλῶσσα (glôssa), meaning "tongue", also known as the adder's-tongue family, is a...

latter group including horsetails, whisk ferns, marattioid ferns and ophioglossoid ferns. The fern crown group, consisting of the leptosporangiates and...

grows only on Jeju Island of South Korea. While this plant is clearly ophioglossoid in the broad sense, its precise cladistic position is uncertain. It...

Spermatophytes Angiosperms Cycads Ginkgo Conifers Gnetophytes Polypodiopsida Ophioglossoid ferns Whisk ferns Marattioid ferns Horsetails Leptosporangiate ferns...

sense that includes horsetails) and that psilophytes are sister to ophioglossoid ferns. Friedman, William E.; Moore, Richard C.; Purugganan, Michael...

both the whisk ferns and horsetails are as much true ferns as are the Ophioglossoids and Marattiaceae. The Marattiaceae are a group of tropical ferns with...