Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 18 April 1969:
Vol. 164. no. 3877, pp. 295 - 296
DOI: 10.1126/science.164.3877.295
Prev | Table of Contents | Next

Articles

Cycads: Fossil Evidence of Late Paleozoic Origin

Sergius H. Mamay 1

1 U. S. Geological Survey, Washington, D.C. 20242

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.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Cataphylls of the Middle Triassic cycad Antarcticycas schopfii and new insights into cycad evolution.
E. J. Hermsen, T. N. Taylor, E. L. Taylor, and D. Wm. Stevenson (2006)
Am. J. Botany 93, 724-738
   Abstract »    Full Text »    PDF »
The Enigmatic Paleozoic plants Spermopteris and Phasmatocycas reconsidered.
B. J. Axsmith, R. Serbet, M. Krings, T. N. Taylor, E. L. Taylor, and S. H. Mamay (2003)
Am. J. Botany 90, 1585-1595
   Abstract »    Full Text »    PDF »
Possible Early Pennsylvanian Ancestor of the Cycadales.
R. L. Leary and R. L. Leary (1990)
Science 249, 1152-1154
   Abstract »    PDF »
A Facultative Gymnosperm from an Interspecific Cotton Hybrid.
V. G. Meyer (1970)
Science 169, 886-888
   Abstract »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)