Since about 2003, Grammitis has been understood as a genus of about 25 species with the other species to be eventually transferred to other genera, most of them new or resurrected. Grammitis sensu strictissimo (about 25 species) is distinguished by its black, sclerified leaf margins.Tom A. Ranker. 2008. "A New Combination in Adenophorus (Polypodiaceae)". American Fern Journal 98(3):170-177. It is sister to the monophyletic genus Cochlidium.
