Progymnosperm

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The progymnosperms are a clade of woody plants including the Ginkgoales, gymnosperms, angiosperms, and many extinct forms such as Archaeopteris.[1] Early progymnosperms had fern-like foliage,[1] which later diversified to give today's variety. They first appear in the fossil record during the Devonian period.[1]

[edit] References

  1. ^ a b c Stewart, W.N.; Rothwell, G.W. (1993). Paleobiology and the evolution of plants. Cambridge University Press, 521pp. 


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