Polypodiales

The order Polypodiales encompasses the major lineages of polypod ferns, which comprise more than 80% of today's fern species. They are found in many parts of the world including tropical, semitropical and temperate areas.

Polypodiales
Polypodium californicum
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Class: Polypodiopsida
Subclass: Polypodiidae
Order: Polypodiales
Link (1833)
Suborders[1]

6. See text

Description

Polypodiales are unique in bearing sporangia with a vertical annulus interrupted by the stalk and stomium.[2] These sporangial characters were used by Johann Jakob Bernhardi to define a group of ferns he called the "Cathetogyratae";[3] the Pteridophyte Phylogeny Group has suggested reviving this name as the informal term cathetogyrates, to replace the ambiguously circumscribed term "polypods" when referring to the Polypodiales.[1] The sporangia are born on stalks 1–3 cells thick and are often long-stalked.[2] (In contrast, the Hymenophyllales have a stalk composed of four rows of cells.)[4] The sporangia do not reach maturity simultaneously. Many groups in the order lack indusia, but when present, they are attached either along the edge of the indusium or in its center.[2]

Both Polypodiales and Cyatheales differ from other ferns in having a photoreceptor called a neochrome, which allows them to perform photosynthesis better in low-light conditions, such as in the shadows on the forest floor. The common ancestor of the two groups appears to have derived the neochrome via horizontal gene transfer from a hornwort.[5]

Their gametophytes are green, usually heart-shaped, and grow at the surface[2] (rather than underground, as in Ophioglossales).[6]

Taxonomy

The order Polypodiales was first described by Link in 1833.[1] The circumscription of the order has changed over time as ferns have been classified in many different ways (see the review by Christenhusz and Chase, 2014).[7] Smith et al. (2006) carried out the first higher-level pteridophyte classification published in the molecular phylogenetic era.[8] They referred to the ferns (now including horsetails) as monilophytes, dividing them into four groups, with the vast majority of species being placed in a taxon they called "Polypodiopsida". The four-fold grouping has persisted through subsequent systems, despite changes in nomenclature.[9][10][7][1] Polypodiopsida is now used for all ferns (sensu lato),[1] with Smith et al.'s group being subclass Polypodiidae. This group, which includes Polypodiales, is also informally known as the leptosporangiate ferns, while the remaining three groups (subclasses) are referred to as eusporangiate ferns. The Polypodiidae have been divided into seven orders, Polypodiales being the largest. The phylogenetic position of Polypodiales in relation to the other orders of Polypodiidae is shown in the following cladogram.[1]

Subclass Polypodiidae
 

Osmundales

 
 
 

Hymenophyllales

 
 
 

Gleicheniales

 
 
 

Schizaeales

 
 
 

Salviniales

 
 
 

Cyatheales

 
 

Polypodiales (6 suborders, 26 families)

 
 
 
 
 
 
 

Subdivision

The division of the Polypodiales into families has changed somewhat between the pioneering work of Smith et al. (2006) and the Pteridophyte Phylogeny Group's classification of 2016, with a general increase in the number of divisions recognized, albeit sometimes at different ranks. The table below summarizes four systems; families are listed alphabetically within three broad groups. Although the same families are used in more than one system, circumscriptions may differ. Christenhusz and Chase in 2014 used a very broad circumscription of Aspleniaceae and Polypodiaceae, reducing families used in other systems to subfamilies.

Comparison of alternative subdivisions of Polypodiales
Smith et al. (2006)[8]Christenhusz et al. (2011)[10]Christenhusz & Chase (2014)[7]PPG I (2016)[1]
Basal families–CystodiaceaeCystodiaceaeCystodiaceae
DennstaedtiaceaeDennstaedtiaceaeDennstaedtiaceaeDennstaedtiaceae
LindsaeaceaeLindsaeaceaeLindsaeaceaeLindsaeaceae
–LonchitidaceaeLonchitidaceaeLonchitidaceae
PteridaceaePteridaceaePteridaceaePteridaceae
SaccolomataceaeSaccolomataceaeSaccolomataceaeSaccolomataceae
Aspleniineae
eupolypods II
(Aspleniaceae)		AspleniaceaeAspleniaceaeAspleniaceae: AsplenioideaeAspleniaceae
–AthyriaceaeAspleniaceae: AthyrioideaeAthyriaceae
BlechnaceaeBlechnaceaeAspleniaceae: BlechnoideaeBlechnaceae
–CystopteridaceaeAspleniaceae: CystopteridoideaeCystopteridaceae
–––Desmophlebiaceae
–DiplaziopsidaceaeAspleniaceae: DiplaziopsidoideaeDiplaziopsidaceae
–––Hemidictyaceae
OnocleaceaeOnocleaceae–Onocleaceae
–RhachidosoraceaeAspleniaceae: RhachidosoroideaeRhachidosoraceae
ThelypteridaceaeThelypteridaceaeAspleniaceae: ThelypteridoideaeThelypteridaceae
WoodsiaceaeWoodsiaceaeAspleniaceae: WoodsioideaeWoodsiaceae
Polypodiineae
eupolypods I
(Polypodiaceae)		DavalliaceaeDavalliaceaePolypodiaceae: DavallioideaeDavalliaceae
––Polypodiaceae: DidymochlaenoideaeDidymochlaenaceae
DryopteridaceaeDryopteridaceaePolypodiaceae: DryopteridoideaeDryopteridaceae
–HypodematiaceaePolypodiaceae: HypodematioideaeHypodematiaceae
LomariopsidaceaeLomariopsidaceaePolypodiaceae: LomariopsidoideaeLomariopsidaceae
–Nephrolepidaceae–Nephrolepidaceae
OleandraceaeOleandraceaePolypodiaceae: OleandroideaeOleandraceae
PolypodiaceaePolypodiaceaePolypodiaceae: PolypodioideaePolypodiaceae
TectariaceaeTectariaceaePolypodiaceae: TectarioideaeTectariaceae

Smith et al. (2006) divided the Polypodiales into fifteen families,[8] a practice continued in their 2008 revision,[11] with members of the eupolypods placed in two unranked clades. The families are listed in the table. While many of these families had previously been recognized with similar circumscriptions, the authors noted that Dryopteridaceae was more narrowly bounded than in historical circumscriptions, which had included their Tectariaceae, Onocleaceae and Woodsiaceae. The circumscription of Lomariopsidaceae changed dramatically, with most historical genera of that family (except Lomariopsis and Thysanosoria) being moved to Dryopteridaceae, while Cyclopeltis and Nephrolepis were added. Saccolomataceae were removed from the dennstaedtioids. Cystodium was tentatively placed in Lindsaeaceae, away from its historical position with the tree ferns. Woodsiaceae was acknowledged to be of uncertain circumscription and perhaps paraphyletic; the inclusion of Hypodematium, Didymochlaena, and Leucostegia perhaps also rendering Dryopteridaceae paraphyletic. The grammitids were included in Polypodiaceae to render that family monophyletic.[8]

The linear sequence of Christenhusz et al. (2011), intended for compatibility with the classification of Chase and Reveal (2009),[9] incorporated new phylogenetic evidence to make several changes at the familial level, resulting in an expansion to 23 families. Lonchitis and Cystodium were removed from the Lindsaeaceae and incorporated into new families, Lonchitidaceae and Cystodiaceae respectively. Within eupolypods I, Woodsiaceae proved to be paraphyletic and was reduced to the genera Cheilanthopsis, Hymenocystis, and Woodsia, while the remainder of its genera were removed to Cystopteridaceae, Diplaziopsidaceae, Rhachidosoraceae, Athyriaceae, and Hemidictyaceae. Within eupolypods II, Nephrolepis was placed in a new family, the Nephrolepidaceae, due to uncertainty in its phylogenetic placement, while Hypodematiaceae was split from Dryopteridaceae to contain the three problematic genera mentioned by Smith et al.[10]

The classification of Christenhusz and Chase (2014) dramatically reduced the number of families recognized in this order to eight by "lumping", reducing many families to subfamilies and expanding the circumscription of Polypodiaceae and Aspleniaceae to encompass all of eupolypods I and eupolypods II, respectively. Former families became subfamilies (see the table above). The former Hemidictyaceae were included in the Asplenioideae, and the Onocleaceae in the Blechnoideae. In the new Polypodiaceae, Didymochlaena was placed in its own subfamily, Didymochlaenoideae.[7]

The PPG I classification (2016) used a process intermediate between the two previous approaches, by introducing a new rank, that of suborder, and organising 26 families (in some cases very narrowly circumscribed) into six suborders, largely returning to the families set out by Christenhusz et al. in 2011. In lieu of the expansion of Aspleniaceae and Polypodiaceae, eupolypods I and II were recognized and named as suborders:[1][7]

  • Saccolomatineae includes the single family Saccolomataceae.
  • Lindsaeinae corresponds to the Lindseaceae of Smith et al., and includes the Cystodiaceae, Lindsaeaceae, and Lonchitidaceae. It is probably not monophyletic.
  • Pteridineae includes the single family Pteridaceae.
  • Dennstaedtiineae includes the single family Dennstaedtiaceae.
  • Aspleniinae (formerly eupolypods I) includes the families Cystopteridaceae, Rhachidosoraceae, Diplaziopsidaceae, Desmophlebiaceae (containing only Desmophlebium), Hemidictyaceae, Aspleniaceae, Woodsiaceae, Onocleaceae, Blechnaceae, Athyriaceae, and Thelypteridaceae.
  • Polypodiineae (formerly eupolypods II) includes the families Didymochlaenaceae (containing only Didymochlaena), Hypodematiaceae, Dryopteridaceae, Lomariopsidaceae, Nephrolepidaceae, Tectariaceae, Oleandraceae, Davalliaceae, and Polypodiaceae.

Phylogeny

In 2016, the Pteridophyte Phylogeny Group published a consensus cladogram, based on "numerous phylogenetic studies" between 2001 and 2015. The subtree for the order Polypodiales is:[1]

Polypodiales
 
 

Saccolomataceae

 
 
 

Cystodiaceae

 
 
 

Lonchitidaceae

 
 

Lindsaeaceae

 
 
 
 
 
 

Pteridaceae

 
 
 

Dennstaedtiaceae

 
eupolypods
 
Aspleniineae (eupolypods II)
 

Cystopteridaceae

 
 
 
 

Rhachidosoraceae

 
 
 

Diplaziopsidaceae

 
 
 

Desmophlebiaceae

 
 
 

Hemidictyaceae

 
 

Aspleniaceae

 
 
 
 
 
 
 
 

Woodsiaceae

 
 
 
 

Onocleaceae

 
 

Blechnaceae

 
 
 

Athyriaceae

 
 
 
 

Thelypteridaceae

 
 
 
 
 
 
Polypodiineae (eupolypods I)
 

Didymochlaenaceae

 
 
 

Hypodematiaceae

 
 
 

Dryopteridaceae

 
 
 
 

Nephrolepidaceae

 
 

Lomariopsidaceae

 
 
 
 

Tectariaceae

 
 
 

Oleandraceae

 
 
 

Davalliaceae

 
 

Polypodiaceae

 
 
 
 
 
 
 
 
 
 
 
 
 

Obsolete families

Now-obsolete families of Polypodiales include:

  • Drynariaceae - now in Polypodiaceae
  • Grammitidaceae - now in Polypodiaceae
  • Gymnogrammitidaceae - now in Polypodiaceae
  • Loxogrammaceae - now in Polypodiaceae
  • Platyceriaceae - now in Polypodiaceae
  • Pleursoriopsidaceae - now in Polypodiaceae
  • Vittariaceae - now in Pteridaceae

Evolution

Polypodiales may be regarded as one of the most evolutionarily advanced orders of monilophytes (ferns), based on recent genetic analysis. They arose and diversified about 100 million years ago, probably subsequent to the diversification of the angiosperms.[12]

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References
  1. Pteridophyte Phylogeny Group 2016.
  2. Smith et al. 2006, p. 713.
  3. Bernhardi 1806, pp. 9–12.
  4. Smith et al. 2006, p. 711.
  5. Li et al. 2014.
  6. Smith et al. 2006, p. 710.
  7. Christenhusz & Chase 2014.
  8. Smith et al. 2006.
  9. Chase & Reveal 2009.
  10. Christenhusz et al. 2011.
  11. Smith et al. 2008.
  12. Schneider et al. 2004.

Bibliography
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