Cycads: Fossil evidence of late paleozoic origin



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Plant fossils from Lower Permian strata of the southwestern United States have been interpreted as cycadalean megasporophylls. They are evidently descended from spermopterid elements of the Pennsylvanian Taeniopteris complex; thus the known fossil history of the cycads is extended from the Late Triassic into the late Paleozoic. Possible implications of the Permian fossils toward evolution of the angiosperm carpel are considered.
Publication type Article
Publication Subtype Journal Article
Title Cycads: Fossil evidence of late paleozoic origin
Series title Science
Volume 164
Issue 3877
Year Published 1969
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Science
First page 295
Last page 296
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