Zimmermannitheca
- Citations total:
- 3
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| original | Namurian A | Poland | Remy,W. et al. Zimmermannitheca cupulaeformis n.gen.,n.sp. | 1959 | |
| details | Namurian | Nd | Millay,M.A. et al. Paleozoic seed fern pollen organs. | 1979 | |
| details | Paleozoic | Nd | Taylor,T.N. Pollen and pollen organ evolution in early seed plants. | 1981 |