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* [https://www.idigbio.org/wiki/images/9/95/Smith_et_al_2006.pdf Smith et al. 2006: recent treatment of ferns] | * [https://www.idigbio.org/wiki/images/9/95/Smith_et_al_2006.pdf Smith et al. 2006: recent treatment of ferns] | ||
*[http://www.indexfungorum.org/ Index Fungorum web site ] | *[http://www.indexfungorum.org/ Index Fungorum web site ] | ||
*[http://www.mobot.org/MOBOT/research/APWeb/ Stevens: Angiosperm Phylogeny website ] |
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