Equisetidae
Introduction
Equisetidae have an emphasis on the Silicon series beside the quality of the Iron series.
They have a conflict between their own family and the community.
Families
1. Psilotaceae: only Family in Pislotales; Whisk ferns; 2 genera, Psilotum, Tmesipteris.
4. Equisetaceae: only Family in Equisetales; 1 genus: Equisetum.
5. Marattiaceae: only Family in Marattiales; 6 genera, Angiopteris, Christensenia, Danaea, Marattia, Eupodium, Ptisana.
7. Ophioglossaceae: only Family in Ophioglossales; 4 genera, Ophioglossum, Botrychium, Helminthostachys, Mankyua.