Concise hierarchy

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

Current position

Ophioglossidae (Subclass) Klinge (1882)

Ref: PPG I, 2016: 571.

Alternative positions

Filicopsida (Class) C.Agardh (1822)	Ref: P.R. Crane & P. Kenrick, 1997: table 7 (p. 98). [inferred rank] [implicit]
Psilotidae (Subclass) Reveal (1996)	Ref: D.J. Mabberley, 2008: 928. [implicit]
Psilotopsida (Class) D.H.Scott (1909)	Ref: Новіков, А. & Барабаш-Красни, Б. / Novikoff, A. & Barabasz-Krasny, B., 2015: 47.
Psilotopsida (Subdivision) Scott (1909)	Ref: J.T. Mickel, 1982: 337.

Historical positions

Ophioglossidae (Subclass) Klinge (1882)	Ref: D.J. Mabberley, 2017: App. (p. 998).
Ophioglossidae (Subclass) Klinge (1882)	Ref: PPG I, 2016: 571.
Ophioglossidae (Subclass) Klinge (1882)	Ref: M.A. Ruggiero et al., 2015b: table 2 (p. 32).
Psilotopsida (Class) D.H.Scott (1909)	Ref: A. Novikoff & B. Barabasz-Krasny, 2015: 47.
Psilotopsida (Class) D.H.Scott (1909)	Ref: D.J. Mabberley, 2008: 928.
Psilotopsida (Class) D.H.Scott (1909)	Ref: A.R. Smith et al., 2006: 709, fig. 2; 726.
Psilotopsida (Class) D.H.Scott (1909)	Ref: A.B. Doweld, 2001: IX.
Filicopsida (Class) C.Agardh (1822)	Ref: P.R. Crane & P. Kenrick, 1997: table 7 (p. 98); fig. 1.
Psilotopsida (Subdivision) Scott (1909)	Ref: J.T. Mickel, 1982: 337.
Psilotopsida (Class) D.H.Scott (1909)	Ref: S.P. Parker, 1982: 1079. [alternative position]

Number of Subtaxa

2024	Available in Systema Naturae 2000	1f;2g;2s
1989-present	Systema Naturae 2000: 16 Jun 2023	[1f;2g]
2017	D.J. Mabberley: 766, App. (p. 998)	[1f;2g;17s]
2016	PPG I: 571	[1f;2g]
2015	A. Novikoff & B. Barabasz-Krasny: 47	[1f;2g]
2008	D.J. Mabberley	[1f;2g;17s]
2006	A.R. Smith et al.: 709	[1f;2g;~12s]
2001	A.B. Doweld: IX	[2f]
1982	J.T. Mickel	1f2g[9s]