Synonyms: Abacopteris simplex (homotypic); Abacopteris simplex var. trifoliata; Aspidium simplex (homotypic); Asplenium simplex; Cyclosorus simplex (homotypic); Cyclosorus simplex var. trifoliata; Dryopteris simplex (homotypic); Meniscium erosum; Meniscium simplex (homotypic); Meniscium villosum; Nephrodium simplex (homotypic); Phegopteris simplex (homotypic); Polypodium nudiusculum (heterotypic); Polypodium simplex; Pronephrium simplex (homotypic); Pronephrium simplex var. trifoliata; Thelypteris simplex; Thelypteris simplex var. trifoliata