We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleHorsetails and ferns are a monophyletic group and the closest living relatives to seed plants.AuthorsPryer KM; Schneider H; Smith AR; Cranfill R; Wolf PG; Hunt JS; Sipes SDPublicationNature, 2001, Vol 409, Issue 6820, p618ISSN0028-0836Publication typearticleDOI10.1038/35054555