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A vascular conducting strand in the early land plant Cooksonia

Edwards, Dianne, Davies, K. L. and Axe, Lindsey 1992. A vascular conducting strand in the early land plant Cooksonia. Nature 357 (6380) , pp. 683-685. 10.1038/357683a0

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THE late Silurian–early Devonian genus Cooksonia, characterized by smooth isotomously branching axes and solitary, terminal sporangia1, has long been regarded as the archetypal vascular plant because of its age and simplicity of organization. The discovery of stomata, sterome2 and thick-walled spores1,3 in Cooksonia pertoni and C. hemisphaericaconfirmed its land-plant status, but tracheids have never been demonstrated in attached axes4. Here we report on tubes with differentially thickened walls typical of tracheary elements found in the central region of axes of Lower Devonian unequivocal C. pertoni, vindicating Lang's belief that Cooksonia was a vascular plant1.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Q Science > QK Botany
Publisher: NPG
ISSN: 0028-0836
Last Modified: 04 Jun 2017 02:09

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