Williamsonianthus
- Citations total:
- 3
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| details | Keuper | Nd | Potonie,R. New phylogenetic facts on fossil spores. | 1967 | |
| details | Keuper | Nd | Potonie,R. Main trends in the evolution of spores. | 1971 | |
| details | Nd | Nd | Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. | 1995 |