Phylogenic studies have shown that the genus "Doodia" is embedded within the paraphyletic genus "Blechnum". Phylogenic studies found "Doodia" to be embedded within the paraphyletic "Blechnum" as then circumscribed. "Doodia aspera" is found all along eastern New South Wales, and into Victoria and Queensland. In 2011, Christenhusz "et al." therefore reassigned "Doodia" species to "Blechnum". Christenhusz "et al.", 2011, therefore reassigned all "Doodia" species to "Blechnum".