What are the synapomorphies for land plants? What does it take?
Secondarily reduced?
How is it like a moss?
A grade? What does it mean?
A grade?
Heterospory and the origin of seeds?
Why sisters? Is this a good interpretation?
Why is this node unresolved?
Biogeography for members of this clade?
Alternative topologies? What data support each?
Double fertilization - what was the ancestral state?
Age of the anthophytes and stratigraphic debt?
Can we resolve this node?
What about Zygopteris, Stauropteris, and Cladoxylon?
Is there a good synapomorphy for ferns?
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