Ceratopteridaceae is an improper family name for the clade that is now known to include the two genera Ceratopteris and Acrostichum.
Ceratopteridoideae is one of the five subfamilies in the Pteridaceae family of ferns.
A fern is a member of a group of vascular plants that reproduce via spores and have neither seeds nor flowers.
Leptosporangiate ferns are the largest group of living ferns, including some 11000 species worldwide.
Below is a list of fern (Pteridophyta) families, and the genera which are placed in them, using the classification scheme proposed by Smith et al. (2006), placed in the linear order of Christenhusz et al. (2011).
Pteridaceae is a family of ferns in the order Polypodiales., including some 1150 known species in ca 45 genera (depending on taxonomic opinions), divided over five subfamilies.
The Pteridales are ferns that have their sori in linear strips under the edge of the leaf tissue, usually with the edge of the lamina reflexed over.
A system of taxonomy of the cryptogams, the Smith system was published in.