Paleozoic origin of the cycads /
| Autor principal: | |
|---|---|
| Formato: | Libro |
| Lenguaje: | English |
| Publicado: |
Washington :
United States Government Printing Office,
1976.
|
| Colección: | Geological survey professional paper
934 |
| Materias: |
| Notas: | "Megasporophylls and associated plants 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" |
|---|---|
| Descripción Física: | iii, 48 páginas, 5 hojas de láminas en blanco y negro : ilustraciones en blanco y negro. |