Nephrodium tetragonum (Sw.) Keyserl. = Thelypteris tetragona (Sw.) Small
English:
tetragonus,-a,-um;

https://archive.org/stream/#page/49/mode/2up
homotypic synonyms:
Aspidium tetragonum (Sw.) Sw.; Dryopteris tetragona (Sw.) Kuntze; Dryopteris tetragona (Sw.) Urban; Goniopteris tetragona (Sw.) C. Presl; Phegopteris tetragona (Sw.) Fée; Phegopteris tetragona (Sw.) Mett.; Polypodium tetragonum Sw.; Thelypteris tetragona (Sw.) Small;

protologue: Polyp. Herb. Bunge 49: 49 (1873)

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