Synonyms: Leptochilus nigrescens; Microsorum ithycarpum; Microsorum longipes; Microsorum malabaricum; Microsorum nigrescens (homotypic); Microsorum variabile; Phymatodes nigrescens (homotypic); Phymatodes nigrescens var. variabilis; Phymatodes nigrescens variabilis; Phymatodes saccata; Phymatodes variabilis; Phymatosorus ithycarpus; Phymatosorus malabaricus; Phymatosorus membranifolius (homotypic); Phymatosorus nigrescens (homotypic); Phymatosorus variabilis; Pleopeltis longissima; Pleopeltis nigrescens; Pleopeltis temenimborensis; Polypodium externatum; Polypodium ithycarpum; Polypodium membranifolium (homotypic); Polypodium membranifolium var. subsimplex; Polypodium nigrescens (homotypic); Polypodium plukenetii; Polypodium saccatum; Polypodium scandens var. membranifolium; Polypodium subnigrescens; Polypodium temenimborense