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Chapter 21 (Rhyniophytes (Protostele (Endarch (Protoxylem in center with…

- - - - Protoxylem in center with metaxylem differentiating on the outer edge of xylem mass
    - - Metaxylem in center and protoxylem on edges
- - - - Telomes
        
        Twigs of last dichotomy
      - Planation
        
        All subdivisions of lateral branch aligned
      - Webbing
        
        Parenchyma develops between telomes and lower branches
      - Sporophyll
        
        Sporangia produced from this evolution
    - - All megaphyllous plants today form a monophyletic clade
      - Monilophytes #
        
        Ferns
        
        Leptosporangiate
        
        Leaf trace
        
        Leaf gap
      - Lignophytes
        
        Woody plants