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2. ORIGIN OF SEED PLANTS: AN ANEUROPHYTE/SEED‐FERN LINK ELABORATED

Author

Gar W. Rothwell and Diane M. Erwin

Subjects
Paleontology, Frond, biology, Archaeopteridales, West virginia, Botany, Genetics, Plant Science, Biological evolution, Fern, biology.organism_classification, Ecology, Evolution, Behavior and Systematics, Devonian
Abstract

Gymnosperm-like stem and frond fragments have been discovered in the same Devonian deposits of West Virginia that yield the most ancient seeds. The vegetative organs exhibit the stem/leaf differentiation and frond structure that are characteristic of seed ferns, but they have a stelar configuration and a protoxylem architecture that are most similar to aneurophytalean progymnosperms. This combination of features supports the hypothesis that aneurophytalean progymnosperms are ancestral to gymnosperms.

Published
1987

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