Paleozoic origin of the cycads /
Saved in:
| Main Author: | |
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington :
United States Department of the Interior, Geological Survey,
1976.
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| Series: | Geological Survey professional paper ;
934. |
| Subjects: | |
| Online Access: | CONNECT |
| Item Description: | Title from title screen (viewed October 6, 2014). "Megasporophylls and associated plant parts from the Upper Pennsylvanian and Lower Permian rocks of the southwestern United States are interpreted as a lineage of cycads, derived from the pteridosperms. Cycadean foliage is thought to be derived from Paleozoic taeniopterids." |
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| Physical Description: | 1 online resource (iii, 48 pages, 5 unnumbered pages of plates) : illustrations. |
| Bibliography: | Includes bibliographical references (pages 44-46) and index. |
