Concise hierarchy

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

Current position

Isoetopsida (Class) Rolle (1885)

Ref: S.P. Parker, 1982: 1079; Novikoff & Barabasz-Krasny, 2015: 46. [alternative position]

Alternative positions

Isoetopsida (Subdivision)	Ref: J.T. Mickel, 1982: 338.
Lycopodiidae (Subclass) Bek. (1863)	Ref: D.J. Mabberley, 2017: App. (p. 997).
Lycopodiopsida (Class) Bartl. (1830)	Ref: M.A. Ruggiero et al., 2015b: table 2 (p. 31); Wiki/Lycopodiopsida(27 Jan 2023); PPG I, 2016: fig. 1.
Lycopsida (Class)	Ref: B. Odé et al., 2010: 74.

Historical positions

Lycopodiidae (Subclass) Bek. (1863)	Ref: D.J. Mabberley, 2017: App. (p. 997).
Lycopodiopsida (Class) Bartl. (1830)	Ref: M.A. Ruggiero et al., 2015b: table 2 (p. 31).
Lycopsida (Class)	Ref: B. Odé et al., 2010: 74.
Lycopsida (Class)	Ref: T.N. Taylor et al., 2009: table (p. 266), App. 1 (p. 1028).
Lycopodiopsida (Class) Bartl. (1830)	Ref: D.J. Mabberley, 2008: 507, 928.
Lycopsida (Class)	Ref: P. Kenrick & P.R. Crane, 1997a: table 7.1 (p. 228).
Lycopsida (Class)	Ref: C.J. Cleal & B.A. Thomas, 1995: 13.
Isoetopsida (Subdivision)	Ref: S.P. Parker, 1982: 338.
Isoetopsida (Class) Rolle (1885)	Ref: J.T. Mickel, 1982: 1079. [alternative position]

Number of Subtaxa

1989-present	Systema Naturae 2000: 3 Mar 2023	[1f;1g; †3f;7g]
2017	D.J. Mabberley: 471, App. (p. 997)	[1f;1g]
2008	D.J. Mabberley	[1f;1g;~200s]
1995	C.J. Cleal & B.A. Thomas: 13	[1f; †1f]
1982	J.T. Mickel	1f1g75s