Blechnum, known as hard fern, is a genus of ferns in the family Blechnaceae, subfamily Blechnoideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I).
The genus Blechnum, commonly referred to as hard fern, falls under the family Blechnaceae, subfamily Blechnoideae, as classified by the Pteridophyte Phylogeny Group in their 2016 report (PPG I).