What is "thelypteridaceae"

Thelypteridaceae is a family of about 900 species of ferns in the eupolypods II clade of the order Polypodiales, in the class Polypodiopsida.

The ferns are terrestrial, with the exception of a few which are lithophytes (grow on rocks). The bulk of the species are tropical, although there are a number of temperate species.

These ferns typically have creeping rhizomes. The fronds are simply pinnate to pinnate- pinnatifid. There is either no frond dimorphism or only mild dimorphism, either open venation or very simple anastomosing. The sori are mostly reniform in shape and have indusia, except for the Phegopteris group.