= Arcypteris difformis (Blume) Underw.; Bull. Torrey Bot. Club 30: 678 (1903)
= Arcypteris irregularis (C.Presl) Ching; Sunyatsenia 3: 251 (1940)
= Aspidium difforme Blume; Enum. Pl. Javae 2: 160 (1828)
= Aspidium irregulare (C.Presl) C.Chr.; Index Filic. 78 (1905)
= Campyloneurum difforme (Blume) T.Moore; Index Fil. [T. Moore] 224 (1861)
= Dictyopteris difformis (Blume) T.Moore; Index Fil. [T. Moore] 90 (1858)
= Dictyopteris irregularis (C.Presl) C.Presl; Tent. Pterid. 194, t. 8, f. 7 (1836)
= Dictyopteris whitfordii Alderw.; Malayan Ferns 519 (1909)
= Drynaria coadunata Brack.; U.S. Expl. Exped., Filic. 16: 49 (1854)
= Lastrea confluens T.Moore; Index Fil. [T. Moore] 88 (1858)
= Phegopteris difformis (Blume) Mett.; Fil. Hort. Bot. Lips. 84, t. 25, f. 8 (1856)
= Phegopteris irregularis (C.Presl) Luerss.; Filic. Graeff. 172 (1871), isonym
= Phegopteris irregularis (C.Presl) Mett.; Ann. Mus. Bot. Lugduno-Batavi 1: 226 (1863)
= Pleopeltis coadunata T.Moore; Index Fil. [T. Moore] 345 (1862)
= Polypodium confertum Roxb.; Calcutta J. Nat. Hist. 4: 493 (1844)
= Polypodium confluens Wall.; Numer. List [Wallich] no. 325 (1829), nomen
= Polypodium difforme (Blume) Blume; Enum. Pl. Javae 2: 135 (1828)
= Polypodium eximium Kunze; Bot. Zeitung (Berlin) 424 (1846)
= Polypodium fecundum Hassk.; Cat. Hort. Bot. Bogor. [Hasskarl] 5 (1844)
= Polypodium irregulare C.Presl; Reliq. Haenk. 1: 25, t. 4, f. 3 (1825)
= Polypodium multiflorum Roxb.; Calcutta J. Nat. Hist. 4: 493 (1844) (non Roth 1797)
= Sagenia difformis (Blume) Christ; Ann. Jard. Bot. Buitenzorg 20: 109 (1905)
= Tectaria irregularis (C.Presl) Copel.; Philipp. J. Sci., C 2: 416 (1907)