Concise hierarchy

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

Current position

Polypodiopsida (Class) Cronquist, Takht. & Zimmerm. (1966)

Ref: PPG I, 2016: 572.

Alternative positions

ferns ([unranked])	Ref: D.J. Mabberley, 2017: App. (p. 998).
Filicopsida (Class) C.Agardh (1822)	Ref: P. Kenrick & P.R. Crane, 1997a: table 7.1 (p. 228).
monilophytes ([unranked])	Ref: M.W. Chase & J.L. Reveal, 2009: 123.
Pteridopsida (Class) Ritgen (1828)	Ref: A.B. Doweld, 2001: XI.
Pteropsida (Class)	Ref: B. Odé et al., 2010: 74.

Historical positions

[Ferns] ([unranked])	Ref: D.J. Mabberley, 2017: App. (p. 998).
Polypodiopsida (Class) Cronquist, Takht. & Zimmerm. (1966)	Ref: PPG I, 2016: 572.
Polypodiopsida (Class) Cronquist, Takht. & Zimmerm. (1966)	Ref: M.A. Ruggiero et al., 2015b: table 2 (p. 32).
Pteropsida (Class)	Ref: B. Odé et al., 2010: 74.
monilophytes ([unranked])	Ref: M.W. Chase & J.L. Reveal, 2009: 123.
monilophytes ([unranked])	Ref: K.M. Pryer et al., 2004: fig. 10.5A-B.
Pteridopsida (Class) Ritgen (1828)	Ref: A.B. Doweld, 2001: XI.
Filicopsida (Class) C.Agardh (1822)	Ref: P. Kenrick & P.R. Crane, 1997a: table 7.1 (p. 228).

Number of Subtaxa

2024	Available in Systema Naturae 2000	7o;44f;300g;258s;9ss;2v; ‡2s; †7f;43g;5s
1989-present	Systema Naturae 2000: 26 Jun 2023	[7o;44f;300g; †7f;43g]
2017	D.J. Mabberley: App. (p. 998)	7o;42f
2016	PPG I: 594	[7o;44f;300g]
2015b	M.A. Ruggiero et al.: table 2 (p. 32)	[7o]
2001	A.B. Doweld: XII	[5o;19f]