Azolla tuganensis
- Citations total:
- 4
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| details | Chattian | Messinian | Worldwide | Kovach,W.L. et al. Worldwide stratigraphic occurrences of Mesozoic and Tertiary megaspores. | 1989 |
| details | Oligocene | Canada(British Columbia) | Hills,L.V. et al. Azolla primaeva and its phylogenetic significance. | 1967 | |
| details | Middle Miocene | Denmark | Friis,E.M. EM: Studies on Salviniaceae megaspores from the Middle Miocene Fasterholt Flora, Denmark. | 1977 | |
| details | Oligocene | USSR(Siberia) | Batten,D.J. et al. Catalog of Mesozoic and Tertiary megaspores | 1990 |