Concise hierarchy
	(Kingdom) Plantae - (Phylum) Tracheophyta - (Class) Polypodiopsida
Current position
	Alternative positions
	
		
			| Eusporangiatae (Subclass) | Ref: 
					
						R.C. van Caenegem et al., 1979-1984 | 
			
				| eusporangiates ([unranked]) | Ref: 
						
							T.N. Taylor et al., 2009: App. 1 (p. 1028). | 
				
					| Filicopsida (Class) C.Agardh (1822) | Ref: 
							
								C.J. Cleal & B.A. Thomas, 1995: 13. | 
					
						| Marattinae (Class) | Ref: 
								
									L.J. Audus & V. Heywood, 1981: 1246. | 
						
							| Marattiopsida (Class) Doweld (2001) | Ref: 
									
										Новіков, А. & Барабаш-Красни, Б. / Novikoff, A. & Barabasz-Krasny, B., 2015: 48. | 
							
								| Marattiopsida (Subdivision) Doweld (2001) | Ref: 
										
											J.T. Mickel, 1982: 342. | 
							
							Historical positions
							
								
									| Marattiidae (Subclass) Klinge (1882) | Ref: 
											
												D.J. Mabberley, 2017: App. (p. 998). | 
									
										| Marattiidae (Subclass) Klinge (1882) | Ref: 
												
													PPG I, 2016: 572. | 
										
											| Marattiidae (Subclass) Klinge (1882) | Ref: 
													
														M.A. Ruggiero et al., 2015b: table 2 (p. 32). | 
											
												| Marattiopsida (Class) Doweld (2001) | Ref: 
														
															A. Novikoff & B. Barabasz-Krasny, 2015: 48. | 
												
													| eusporangiates ([unranked]) | Ref: 
															
																T.N. Taylor et al., 2009: table (p. 386), App. 1 (p. 1028). | 
													
														| Marattiopsida (Class) Doweld (2001) | Ref: 
																
																	D.J. Mabberley, 2008: 928. | 
														
															| Marattiopsida (Class) Doweld (2001) | Ref: 
																	
																		A.R. Smith et al., 2006: 709, fig. 2; 726. | 
															
																| Marattiopsida (Class) Doweld (2001) | Ref: 
																		
																			A.B. Doweld, 2001: VII.
																		 [new position] | 
																
																	| Filicopsida (Class) C.Agardh (1822) | Ref: 
																			
																				P.R. Crane & P. Kenrick, 1997: table 7 (p. 98); fig. 1. | 
																	
																		| Filicopsida (Class) C.Agardh (1822) | Ref: 
																				
																					C.J. Cleal & B.A. Thomas, 1995: 13. | 
																		
																			| Marattiopsida (Subdivision) Doweld (2001) | Ref: 
																					
																						J.T. Mickel, 1982: 342. | 
																			
																				| Marattiopsida (Class) Doweld (2001) | Ref: 
																						
																							S.P. Parker, 1982: 1079.
																						 [alternative position] | 
																				
																					| Marattinae (Class) | Ref: 
																							
																								L.J. Audus & V. Heywood, 1981: 1246. | 
																				
																				Number of Subtaxa