Family CN: Royal Fern Family Family Code: OSMUND Family Parent: [in OSMUNDALES] Family Authority: Martinov 1820 Summary: A family of 4 genera and about 15-25 species. Schneider et al. (2015) estimate the divergence time between Osmundastrum and Osmunda at > 200 million years. Reference: Metzgar et al. (2008)=Z; Schneider et al. (2015); Lellinger (1985); Whetstone & Atkinson in FNA (1993b); Kramer in Kramer & Green (1990); Yatabe, Nishida, & Murakami (1999). Last Updated: 2020-01-01 Publish: 1