Order Hymenophyllales Frank 1877 (fern)
Polypodiopsida - Hymenophyllales - Polypodiidae
Parent taxon: Polypodiidae according to PPG. I 2016
Sister taxa: Cyatheales, Gleicheniales, Osmundales, Polypodiales, Salviniales, Schizaeales
Subtaxa: Hymenophyllaceae
Distribution:
• Quaternary of India (1 collection)
• Eocene of United States (1: Wyoming)
• Paleocene of United States (1: North Dakota)
• Cretaceous of Germany (1)
• Permian of United States (1: Oklahoma)
• Carboniferous of Canada (1: New Brunswick), Portugal (2), Spain (2), Turkey (1), United States (23: Alabama, Colorado, Georgia, Illinois, Indiana, Oklahoma)
Total: 34 collections including 36 occurrences