Corpus ID: 30089201

ARCHAEOSPERMA ARNOLDZZ-A CUPULATE SEED FROM THE UPPER DEVONIAN O F NORTH AMERICA

@inproceedings{Pettitt2006ARCHAEOSPERMAAC,
  title={ARCHAEOSPERMA ARNOLDZZ-A CUPULATE SEED FROM THE UPPER DEVONIAN O F NORTH AMERICA},
  author={John M. Pettitt and Charles B. Beck},
  year={2006}
}
A new seed, Archaeosperma arnoldii, n. gen. and n. sp., from the Upper Devonian of North America, provides evidence for the existence of gymnospermous plants in preMississippian times. This discovery is significant in relation to the origin and evolution of the seed habit. 
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Archaeopteris specimens were collected in the summer of 1962 from Upper Devonian rocks at the head of Goose Fiord, Ellesmere Island, Arctic Canada. The collections include two species: A. fissilis ...
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TLDR
It is suggested that Actinopodium, Svalbardia and Siderella are related closely to Archaeopteris and that this group of genera shows evolutionary stages in webbing of leaves and planation of branch systems.
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