en.wikipedia.org
en.wikipedia.org
hardyfernlibrary.com
hardyfernlibrary.com
https://hardyfernlibrary.com › ferns › listSpecies_Auto_131.html
powo.science.kew.org
Plants of the World Online
https://powo.science.kew.org › taxon › urn:lsid:ipni.org:names:17076270-1
inaturalist.org
gbif.org
archive.bsbi.org.uk
archive.bsbi.org.uk
archive.bsbi.org.uk › Wats28p57.pdf
encyclopaedia.alpinegardensociety.net
Alpine Garden Society
encyclopaedia.alpinegardensociety.net › plants › Cystopteris
worldfloraonline.org
World Flora Online
https://www.worldfloraonline.org › taxon › wfo-0001224828
rhs.org.uk
pteridoportal.org
pteridoportal.org
https://www.pteridoportal.org › portal › taxa › index.php?tid=14137
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