Reconsidering Relationships among Stem and Crown Group Pinaceae: Oldest Record of the Genus Pinus from the Early Cretaceous of Yorkshire, United Kingdom

@article{Ryberg2012ReconsideringRA,
  title={Reconsidering Relationships among Stem and Crown Group Pinaceae: Oldest Record of the Genus Pinus from the Early Cretaceous of Yorkshire, United Kingdom},
  author={Patricia E. Ryberg and Gar W Rothwell and Ruth A. Stockey and Jason Hilton and Gene Mapes and James B. Riding},
  journal={International Journal of Plant Sciences},
  year={2012},
  volume={173},
  pages={917 - 932}
}
This study describes a specimen that extends the oldest fossil evidence of Pinus L. to the Early Cretaceous Wealden Formation of Yorkshire, UK (131–129 million years ago), and prompts a critical reevaluation of criteria that are employed to identify crown group genera of Pinaceae from anatomically preserved seed cones. The specimen, described as Pinus yorkshirensis sp. nov., is conical, 5 cm long, and 3.1 cm in maximum diameter. Bract/scale complexes are helically arranged and spreading… Expand
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Developmental studies of living cupressaceous seed cones indicate that the range of mature morphologies is strongly correlated with differences in the timing and rate of development for the bract, scale, and ovules, thus supporting the hypothesis that heterochrony plays a major role in the evolution of bract/scale form. Expand
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The symmetrical cone shape, nonreflexed cone base, flattened apophyses, cone serotiny, and seed wing length distinguish these cones from P. contorta, a new species of Pinus subgenus Pinus Subsection Contortae, Pinus matthewsii sp. Expand
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TLDR
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