Polypodiales

Sori on the underside of the deer tongue ( Asplenium scolopendrium )

The Tüpfelfarnartigen ( Polypodiales ) are the most species-rich order of ferns.

Features

The sporangia are covered by a laterally or centrally attached indusium. In several lines of development are the indusia but lost secondarily again. The Sporangienstiel is one to three cell layers thick and often quite long. The maturation of the sporangia in not synchronous. The sporangia have a vertical annulus.

The gametophytes are green and heart-shaped usually rare band-like ( in some epiphytes ); they live on the soil surface.

System

The Polypodiales are the sister group of tree ferns. Together with the straight spore Salviniales they form the core Leptosporangiaten ferns. You are a monophyletic group and are likely to before around 220 million years ( Triassic) have separated from the tree ferns. Under the current system they used to be divided into 15 families. They comprise about 80 percent of all extant species of ferns. There are around 9,300 described species.

• Order Polypodiales Family Lindsaeaceae
• Family Saccolomataceae
• Family Adlerfarngewächse ( Dennstaedtiaceae )
• Family Saumfarngewächse ( Pteridaceae )
• Family Streifenfarngewächse ( Aspleniaceae )
• Family Sumpffarngewächse ( Thelypteridaceae )
• Family Wimperfarngewächse ( Woodsiaceae )
• Family Rippenfarngewächse ( Blechnaceae )
• Family Onocleaceae
• Family Wurmfarngewächse ( Dryopteridaceae )
• Family Lomariopsidaceae
• Family Tectariaceae
• Family Oleandraceae
• Family Davalliaceae
• Tüpfelfarngewächse family ( Polypodiaceae )

For the assignment of the genera, see Systematics of ferns