Polypodioideae is a

subfamily In biological classification, a subfamily (Latin: ', plural ') is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus. Standard nomenclature rules end botanical subfamily names with "-oideae", and zo ...

belonging to the fern family

Polypodiaceae Polypodiaceae is a Family (biology), family of ferns. In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), the family includes around 65 genus, genera and an estimated 1,650 species and is placed in the order Polypodiales, suborder ...

, which is a member of the suborder

Polypodiineae Polypodiineae is a suborder of ferns in the order Polypodiales. It is equivalent to the clade eupolypods I in earlier systems, and to the very broadly defined family Polypodiaceae in the classification of Christenhusz & Chase (2014). It probably ...

in the

Pteridophyte Phylogeny Group The Pteridophyte Phylogeny Group (PPG) is an informal international group of systematic botanists who collaborate to establish on the classification of pteridophytes ( lycophytes and ferns) that reflects knowledge about plant relationships discove ...

classification of 2016 (PPG I). Alternatively, the subfamily may be treated as the tribe Polypodieae within a very broadly defined family Polypodiaceae ''

sensu lato ''Sensu'' is a Latin word meaning "in the sense of". It is used in a number of fields including biology, geology, linguistics, semiotics, and law. Commonly it refers to how strictly or loosely an expression is used in describing any particular co ...

''.

Taxonomy

Two very different circumscriptions of the subfamily were in use . In the first, such as the

classification of 2016 (PPG I) used here, the subfamily Polypodioideae is one of a number of subfamilies of the family Polypodiaceae which is part of the suborder Polypodiineae. In the second, the whole of the suborder is placed in a very broadly defined Polypodiaceae ''sensu lato'', in which the subfamily Polypodioideae ''sensu lato'' is equivalent to the family Polypodiaceae and the tribe Polypodieae to the subfamily Polypodioideae. The equivalence is shown in the following table.

History

Mabberley, in 2008, defined this subfamily in a very broad sense, including all of Polypodiaceae except for the Platycerioideae (''

Platycerium ''Platycerium'' is a genus of about 18 fern species in the polypod family, Polypodiaceae. Ferns in this genus are widely known as staghorn or elkhorn ferns due to their uniquely shaped fronds. This genus is Epiphyte, epiphytic and is native to tr ...

'' and '' Pyrrosia'') and the grammitid ferns, which he placed in Grammitidaceae. His tribe Polypodieae corresponded to Polypodioideae in the sense of PPG I. Christenhusz ''et al.'', in 2011, incorporated phylogenetic evidence to recircumscribe the subfamily, combining the grammitids with Mabberley's Polypodieae (recognizing a number of segregate genera). The classification of Christenhusz and Chase in 2014 vastly expanded the circumscription of Polypodiaceae, redefined Polypodioideae be what had been theretofore recognized as Polypodiaceae, including the grammitids. The tribe Polypodieae corresponded to the subfamily Polypodioideae in Christenhusz ''et al.'' The most recent circumscription of the subfamily, the PPG I classification, largely returns to that of Christenhusz ''et al.'', but excludes the grammitids as subfamily

Grammitidoideae Grammitidoideae is a subfamily of the fern family Polypodiaceae, whose members are informally known as grammitids. It comprises a clade of about 750 species. They are distributed over higher elevations in both the Old World, Old and New World. T ...

, rendering the Polypodioideae potentially paraphyletic.

Phylogeny

The following phylogram shows a likely relationship between Polypodioideae and the other subfamilies within Polypodiaceae, based on groups described by Schuettpelz & Pryer, 2008, using the subfamily names of PPG I.

Genera

The

classification of 2016 (PPG I) recognizes the following genera: * '' Campyloneurum'' C.Presl * '' Microgramma'' C.Presl * '' Niphidium'' J.Sm. * '' Pecluma'' M.G.Price. * '' Phlebodium'' (R.Br.) J.Sm. * '' Pleopeltis'' Humb. & Bonpl. ex Willd. * '' Pleurosoriopsis'' Fomin * '' Polypodium'' L. Perhaps * '' Serpocaulon'' A.R.Sm.

References

{{Taxonbar, from=Q2417265 * Epiphytes Plant subfamilies