The Protolepidodendrales evolved tree-like characteristics independent of other tracheophytes. They probably developed leaves both by enations and by planation of a branching system. They were also the first members of the Lycophyte lineage to evolve wood and bark, a modified shoot system that acts as a rooting system, bipolar growth and an upright plant habit. Some of them had large stems and bark superficially resembling that of the Carboniferous scale trees, implying that some, such Protolepidodendropsis, were a few meters high, and by the late Devonian had evolved into proper trees like Cyclostigma.
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| - The Protolepidodendrales evolved tree-like characteristics independent of other tracheophytes. They probably developed leaves both by enations and by planation of a branching system. They were also the first members of the Lycophyte lineage to evolve wood and bark, a modified shoot system that acts as a rooting system, bipolar growth and an upright plant habit. Some of them had large stems and bark superficially resembling that of the Carboniferous scale trees, implying that some, such Protolepidodendropsis, were a few meters high, and by the late Devonian had evolved into proper trees like Cyclostigma.
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| - The Protolepidodendrales evolved tree-like characteristics independent of other tracheophytes. They probably developed leaves both by enations and by planation of a branching system. They were also the first members of the Lycophyte lineage to evolve wood and bark, a modified shoot system that acts as a rooting system, bipolar growth and an upright plant habit. Some of them had large stems and bark superficially resembling that of the Carboniferous scale trees, implying that some, such Protolepidodendropsis, were a few meters high, and by the late Devonian had evolved into proper trees like Cyclostigma.
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