The phylogenetic positions of two species from Lord Howe Island assigned to the genus Grammitis, G. nudicarpa and G. pulchella, and two small Australian grammitid fern genera, Aenigmatogrammitis and Howeogrammitis, were investigated through phylogenetic analyses of atpB, rbcL, rps4–trnS, trnG–trnR and trnL–trnF chloroplast sequences. Grammitis nudicarpa and G. pulchella were shown to be misplaced in Grammitis, instead being placed in a clade comprised of Archigrammitis, Oreogrammitis and Prosaptia. A new genus, Phaneroloma, is here described to accommodate those two species. Descriptions of both Phaneroloma species and an identification key to the species is provided. The phylogenetically isolated positions of Aenigmatogrammitis stenophylla and Howeogrammitis diminuta previously found with fewer chloroplast markers were confirmed, supporting their continued recognition as separate genera.
Armstrong et al. (Sat,) studied this question.