“…This group has been recognized for more than 100 years (Potonié and Bernard, 1904; Pichi‐Sermolli, 1959) and it occupies a key position in discussions of the origins of both ferns and sphenopsids (Skog and Banks, 1973; Stein, 1982; Stein et al, 1984; Stewart and Rothwell, 1993; Kenrick and Crane, 1997; Xue et al, 2010). The steady addition of taxa to the group and their taxonomic treatments have led to several classification schemes that are partially overlapping, yet not entirely congruent (e.g., Berry and Stein, 2000; Cordi and Stein, 2005; Meyer‐Berthaud et al, 2007; Xue et al, 2010; Wang et al, 2017). Despite this situation, to date, only one study has addressed phylogenetic relationships in this group (Xue et al, 2010).…”