Polypodium arvonicum Polypodium hyperboreum Ceterach alpina Acrostichum hyperboreum Trichocyclus hyperboreus Woodsia hyperborea Acrostichum alpinum Woodsia bellii Woodsia alpina var. bellii Woodsia alpina var. alpina Woodsia ilvensis var. alpina Woodsia himalaica Woodsia glabella var. bellii Woodsia ilvensis subsp. alpina Woodsia alpina subsp. bellii
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024