EKRT, L.; JESSEN, S.; NOVÁK, P.; VEJVODOVÁ, K.; KALNÍKOVÁ, V.; LUSTYK, P.; FRASER-JENKINS, C. R. Polystichum caucasicum sp. nov. (Dryopteridaceae), a new, surprisingly hexaploid fern species from the Caucasus. Phytotaxa, Auckland, New Zealand, v. 736, n. 3, p. 275–287, 2025. DOI: 10.11646/phytotaxa.736.3.4. Disponível em: https://phytotaxa.mapress.com/pt/article/view/phytotaxa.736.3.4. Acesso em: 1 jan. 2026.