What is "cryptogrammaceae"

Cryptogrammaceae is a small family of ferns, which appears to be somewhat isolated from the rest of the Pteridales. This family forms a natural clade that is the most basal to the order. Of these, Llavea is the most basal within the clade.

Based on phylogenetic research, Smith et al. (2006) included Cryptogrammaceae as part of the family Pteridaceae and Christenhusz et al. (2011) listed its three genera in Cryptogrammoideae , one of five subfamilies of Pteridaceae.