Polystichum stenophyllum Polystichum niitakayamense Polystichum pseudostenophyllum Polystichum stenophyllum var. stenophyllum Polystichum conaense Polystichum stenophyllum var. conaense Polystichum deversum Polystichum stenophyllum var. abbreviatum Aspidium caespitosum var. stenophyllum
Taxonomic data from World Flora Online, accessed June 20, 2024