A Simple Type of Wood in Two Early Devonian Plants

@article{Gerrienne2011AST,
  title={A Simple Type of Wood in Two Early Devonian Plants},
  author={Philippe Gerrienne and Patricia G. Gensel and Christine Strullu‐Derrien and Hubert Lardeux and Philippe Steemans and Cyrille Prestianni},
  journal={Science},
  year={2011},
  volume={333},
  pages={837 - 837}
}
The earliest evolution of wood occurred in plants of surprisingly small stature. The advent of wood (secondary xylem) is a major event of the Paleozoic Era, facilitating the evolution of large perennial plants. The first steps of wood evolution are unknown. We describe two small Early Devonian (407 to 397 million years ago) plants with secondary xylem including simple rays. Their wood currently represents the earliest evidence of secondary growth in plants. The small size of the plants and the… 

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