Biology:Eupolypods I

Eupolypods I
Common Polypody, Polypodium vulgare
Scientific classification
Kingdom:	Plantae
Division:	Pteridophyta
Class:	Polypodiopsida /  Pteridopsida (disputed)
Order:	Polypodiales
(unranked):	Eupolypods I
Families
Polypodiaceae Davalliaceae Oleandraceae Tectariaceae Lomariopsidaceae Dryopteridaceae Elaphoglossaceae Hypodematiaceae Note: This is alternatively treated as the single family Polypodiaceae, with the families outlined here treated as subfamilies

Eupolypods I is a clade of ferns in the order Polypodiales, class Polypodiopsida. In the classification of Christenhusz & Chase (2014) this is equivalent to the family Polypodiaceae. It probably diverged from Eupolypods II (= Aspleniaceae of Christenhusz & Chase 2014) during the mid-Cretaceous. The divergence is supported by both molecular data and an often overlooked morphological characteristic which lies in the vasculature of the petiole. Most species that make up the Eupolypods I clade have three vascular bundles. The only exceptions are the Grammitid ferns which have one, and the genus Hypodematium which has two. This differs from Eupolypods II which mostly have two vascular bundles (except the well-nested blechnoid ferns which generally have at least three).

Phylogenic relationships

The following phylogram for the eupolypods I is based on Lehtonen, 2011 and Christenhusz et al., 2011.

eupolypods I	Hypodematiaceae     Dryopteridaceae   Dryopteridoideae     Elaphoglossoideae         Lomariopsidaceae       Nephrolepidaceae       Tectariaceae       Oleandraceae       Davalliaceae   Polypodiaceae   Loxogrammoideae         Drynarioideae       Platycerioideae     Microsoroideae         Polypodioideae

References

Wikidata ☰ Q5410882 entry