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Microphylls and megaphylls
Asteroxylon
Baragwanathia
Equisetum
Equisetum
Homology (biology)
Isoëtes
Lepidodendron
Lycopodiopsida
Psilotum
Stele (biology)
Vegetation classification
Zosterophyll
enation
evolution
fossil
gymnosperm
leaf
leaf gap
living fossil
plant
rhyniophyte