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

https://archive.org/stream/novageneraspecie00swar#page/132/mode/2up
homotypic synonyms:
Aspidium tetragonum (Sw.) Sw.; Dryopteris tetragona (Sw.) Kuntze; Dryopteris tetragona (Sw.) Urban; Goniopteris tetragona (Sw.) C. Presl; Nephrodium tetragonum (Sw.) Keyserl.; Phegopteris tetragona (Sw.) Fée; Phegopteris tetragona (Sw.) Mett.; Thelypteris tetragona (Sw.) Small;

protologue: Prodr. (Swartz) : 132 (1788)

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