User:Nonenmac/Fern phylograms

All ferns 2006
This phylograms is based directly on Smith, Pryer, Schuettpelz, Korall, Schneider, Wolf (2006). "A classification for extant ferns"

All ferns 2010
This is based on Christenhusz et al.: A linear sequence of extant families and genera of lycophytes and ferns (2011) and Rai and Graham: Monilophyte Phylogeny (2010) Note that Equisetaceae branches first, and the Lindsaeaoid families are different than in the previous phylogram.

All ferns 2010 (take 2)
Same list, attempting to include classes and orders:

Phylogenic retlationships
The following phylogram shows a likely relationship between the other vascular plant classes and the leptosporangiate ferns. Note that these relationships are far from settled. For example, this diagram shows Equisetopsida as a sister to Polypodiopsida. Depending on how the data was interpreted (e.g. using Parsimony vs. maximum-likelihood analyses), Equisetopsida could just as well have been placed a sister to a Marattiopsida/Polypodiopsida clade.

Cladistics
While it is generally accepted that the leptosporangiate ferns are monophyletic, it is considered to be likely that the eusporangiate ferns, as a group, are polyphyletic. As shown in the examples from three recently published phylograms in the following table, it can be seen that the four eusporangiate fern families do not form a single clade.