What is "polypodioideae"

Polypodioideae is a subfamily belonging to the fern family Polypodiaceae. The subfamily name Polypodioideae has two recent uses. The first by Mabberley, 2008, included a larger group of polygrams, (said to possess scales and/or hairs; never stellate), which included six tribes, one of which, Polypodieae, is considered to be a synonym of the more recent sense of Polypodioideae by Christenhusz et al., 2011, in which Polypodiaceae contains five subfamilies, including the smaller Polypodioideae subfamily.