Diario de radekwalkowiak

https://academic.oup.com/botlinnean/article-abstract/189/4/311/5420235?redirectedFrom=fulltext
https://internationalequisetologicalassociation.yolasite.com/taxonomy.php

http://www.plantcell.org/content/27/6/1567.long

https://www.jstor.org/stable/25063959?seq=1#page_scan_tab_contents

https://academic.oup.com/aob/article/95/5/807/201342

https://internationalequisetologicalassociation.yolasite.com/taxonomy.php

https://academic.oup.com/botlinnean/article-abstract/189/4/311/5420235?redirectedFrom=fulltext

https://internationalequisetologicalassociation.yolasite.com/resources/IEA-Paper-2012.pdf

https://internationalequisetologicalassociation.yolasite.com/resources/Classification%20of%20Pteridophytes.pdf

E. telmateia Ehrh. subsp. telmateia = E. telmateia Ehrh.
E. telmateia Ehrh. subsp. braunii (Milde) Hauke = E. braunii Milde
https://academic.oup.com/botlinnean/article-abstract/189/4/311/5420235?redirectedFrom=fulltext

E. hyemale L. ssp./var. hyemale = E. hyemale L.
E. hyemale L. ssp./var. affine (Engelm.) A.A.Eat. = E. praealtum Raf.
https://academic.oup.com/botlinnean/article-abstract/189/4/311/5420235?redirectedFrom=fulltext