Polypodiidae (plant)

Polypodiidae
Pteridium aquilinum
Scientific classification
Kingdom:	Plantae
Subkingdom:	Embryophyta
(unranked):	Tracheophyta
(unranked):	Euphyllophytes
Class:	Polypodiopsida
Subclass:	Polypodiidae Cronquist 1966
Orders
Osmundales Hymenophyllales Gleicheniales Schizaeales Salviniales Cyatheales Polypodiales
Synonyms
Polypodiopsida

Polypodiidae is a subclass of Polypodiopsida (ferns), and of the four subclasses comprises the vast number of species. It is equivalent to the Polypodiopsida sensu stricto in the system of Smith et al. (2006).

Taxonomy

The division of the ferns (Polypodiopsida) sensu lato into four major groups has been demonstrated using both molecular and morphological criteria. Smith et al. (2006) carried out the first higher-level pteridophyte classification published in the molecular phylogenetic era, and considered the ferns as monilophytes, with four classes, referring to this group as Polypodiopsida sensu stricto.

Later classifications renamed the group Polypodiidae, initially as a subclass of Equisetopsida sensu lato. This subclass comprises leptosporangiate ferns as opposed to the remaining three subclasses which are informally referred to as eusporangiate ferns.The following diagram shows a likely phylogenic relationship between subclass Polypodiidae and the other Equisetopsida subclasses in that system

Equisetopsida Marchantiidae Bryidae Anthocerotidae Lycopodiidae Equisetidae Ophioglossidae Marattiidae Polypodiidae Cycadidae Ginkgoidae Gnetidae Pinidae Magnoliidae

bryophytes lycopodiophytes monilophytes gymnosperms angiosperms

In 2014 Christenhusz and Chase grouped all the fern subclasses together as Polypodiophyta and in 2016 the Pteridophyte Phylogeny Group (PPG) adopted the class Polypodiopsida sensu lato for the four fern subclasses. The following cladogram shows the phylogenic relationship between the subclasses according to the PPG. The first three small subclasses being informally grouped as eusporangiate ferns, in contrast to the Polypodiidae or leptosporangiate ferns. Polypodiidae is shown as a sister group of Marattiidae.

Polypodiopsida	Equisetidae Ophioglossidae Marattiidae Polypodiidae

Subdivision

In the PPG classification the Polypodiidae are divided into seven orders (Osmundales, Hymenophyllales, Gleicheniales, Schizaeales, Salviniales, Cyatheales, and Polypodiales), 44 families, 300 genera, and an estimated 10,323 species.

These seven orders are phylogenetically related as follows:

Polypodiidae	Osmundales 1 family Hymenophyllales 1 family Gleicheniales 3 families Schizaeales 3 families Salviniales 2 families Cyatheales 8 families Polypodiales 6 suborders, 26 families

Bibliography

• Chase, Mark W.; Reveal, James L. (2009). "A phylogenetic classification of the land plants to accompany APG III". Botanical Journal of the Linnean Society. 161: 122–127. doi:10.1111/j.1095-8339.2009.01002.x. {{cite journal}}: Cite has empty unknown parameter: |1= (help); Invalid |ref=harv (help)
• Christenhusz, M. J. M.; Zhang, X. C.; Schneider, H. (18 February 2011). "A linear sequence of extant families and genera of lycophytes and ferns". Phytotaxa. 19 (1): 7. doi:10.11646/phytotaxa.19.1.2.
• Christenhusz, Maarten J.M.; Chase, Mark W. (2014). "Trends and concepts in fern classification". Annals of Botany. 113 (4): 571–594. doi:10.1093/aob/mct299. PMC 3936591. PMID 24532607. {{cite journal}}: Invalid |ref=harv (help)
• Pryer, Kathleen M.; Schneider, Harald; Smith, Alan R.; Cranfill, Raymond; Wolf, Paul G.; Hunt, Jeffrey S.; Sipes, Sedonia D. (2001). "Horsetails and ferns are a monophyletic group and the closest living relatives to seed plants". Nature. 409 (6820): 618–622. doi:10.1038/35054555. PMID 11214320.
• Pteridophyte Phylogeny Group (November 2016). "A community-derived classification for extant lycophytes and ferns". Journal of Systematics and Evolution. 54 (6): 563–603. doi:10.1111/jse.12229. {{cite journal}}: Invalid |ref=harv (help)
• Schneider, Harald; Smith, Alan R.; Pryer, Kathleen M. (1 July 2009). "Is Morphology Really at Odds with Molecules in Estimating Fern Phylogeny?". Systematic Botany. 34 (3): 455–475. doi:10.1600/036364409789271209.
• Smith, Alan R.; Kathleen M. Pryer; Eric Schuettpelz; Petra Korall; Harald Schneider; Paul G. Wolf (2006). "A classification for extant ferns" (PDF). Taxon. 55 (3): 705–731. doi:10.2307/25065646. JSTOR 25065646.