Callospermarion
- Citations total:
- 2
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| details | Middle Pennsylvanian | Nd | Rothwell,G.W. Evidence for a pollination-drop mechanism in Paleozoic Pteridosperms. | 1977 | |
| details | Nd | Nd | Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. | 1995 |