Origin and Radiation of the Earliest Vascular Land Plants

@article{Steemans2009OriginAR,
  title={Origin and Radiation of the Earliest Vascular Land Plants},
  author={P. Steemans and A. H{\'e}riss{\'e} and J. Melvin and Merrell A. Miller and F. Paris and J. Verniers and C. Wellman},
  journal={Science},
  year={2009},
  volume={324},
  pages={353 - 353}
}
Colonization of the land by plants most likely occurred in a stepwise fashion starting in the Mid-Ordovician. The earliest flora of bryophyte-like plants appears to have been cosmopolitan and dominated the planet, relatively unchanged, for some 30 million years. It is represented by fossilized dispersed cryptospores and fragmentary plant remains. In the Early Silurian, cryptospore abundance and diversity diminished abruptly as trilete spores appeared, became abundant, and underwent rapid… Expand

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