Concise hierarchy

(Kingdom) Plantae - (Phylum) Tracheophyta - (Class) Polypodiopsida

Subsequent positions

Leptosporangiatae (Clade) Bessey 1907 [Cantino & Donoghue 2007]

Ref: P.D. Cantino et al., 2007: E16.

Current position

Polypodiidae (Subclass) Cronquist, Takht. & Zimmerm. (1966)

Ref: PPG I, 2016: 574; PPG I, 2016: fig. 1.

Alternative positions

core leptosporangiates ([unranked])	Ref: A.R. Smith et al., 2006: 708.
Filicopsida (Class) C.Agardh (1822)	Ref: J.T. Mickel, 1982: 346.
Leptosporangiatae (Subclass) Bessey (1907)	Ref: R.C. van Caenegem et al., 1979-1984
Leptosporangiatae (Clade) Bessey 1907 [Cantino & Donoghue 2007]	Ref: P.D. Cantino et al., 2007: E16. [new position]
leptosporangiates ([unranked])	Ref: T.N. Taylor et al., 2009: App. 1 (p. 1028).
Polypodiopsida (Class) Cronquist, Takht. & Zimmerm. (1966)	Ref: Новіков, А. & Барабаш-Красни, Б. / Novikoff, A. & Barabasz-Krasny, B., 2015: 50.
Salviniidae (Subclass) Reveal (1996)	Ref: A.B. Doweld, 2001: X.
Salvininae (Class)	Ref: L.J. Audus & V. Heywood, 1981: 1247.

Historical positions

Polypodiidae (Subclass) Cronquist, Takht. & Zimmerm. (1966)	Ref: D.J. Mabberley, 2017: App. (p. 998).
Polypodiidae (Subclass) Cronquist, Takht. & Zimmerm. (1966)	Ref: PPG I, 2016: 574.
Polypodiidae (Subclass) Cronquist, Takht. & Zimmerm. (1966)	Ref: M.A. Ruggiero et al., 2015b: table 2 (p. 32).
Polypodiopsida (Class) Cronquist, Takht. & Zimmerm. (1966)	Ref: A. Novikoff & B. Barabasz-Krasny, 2015: 50.
leptosporangiates ([unranked])	Ref: T.N. Taylor et al., 2009: table (p. 386), App. 1 (p. 1028).
Polypodiopsida (Class) Cronquist, Takht. & Zimmerm. (1966)	Ref: D.J. Mabberley, 2008: 928.
Leptosporangiatae (Clade) Bessey 1907 [Cantino & Donoghue 2007]	Ref: P.D. Cantino et al., 2007: E16. [new position]
core leptosporangiates ([unranked])	Ref: A.R. Smith et al., 2006: 711, fig. 2; 726.
Polypodiidae (Subclass) Cronquist, Takht. & Zimmerm. (1966)	Ref: K.M. Pryer et al., 2004: fig. 10.5B.
Salviniidae (Subclass) Reveal (1996)	Ref: A.B. Doweld, 2001: X.
Filicopsida (Subdivision) Pfefferkorn (1976)	Ref: J.T. Mickel, 1982: 346.
Filicopsida (Class) C.Agardh (1822)	Ref: S.P. Parker, 1982: 1079. [alternative position]
Salvininae (Class)	Ref: L.J. Audus & V. Heywood, 1981: 1247.

Number of Subtaxa

2025	Available in Systema Naturae 2000	2f;5g;16s;1ss; †2f;4g
1989-present	Systema Naturae 2000: 19 Apr 2023	[2f;5g; †2f;4g]
2017	D.J. Mabberley: App. (p. 998)	[2f;5g]
2016	PPG I: 575	[2f;5g]
2015	A. Novikoff & B. Barabasz-Krasny: 50	[2f;5g; †2f;5g]
2008	D.J. Mabberley	[2f;5g]
2006	A.R. Smith et al.	[2f;5g;~91s]
2001	A.B. Doweld: X	[2f]
1982	J.T. Mickel	2f[2g18s]
1981	L.J. Audus & V. Heywood	[2f;2g;21s]