| details |
Late Rupelian |
Piacenzian |
Worldwide |
Kovach,W.L. et al. Worldwide stratigraphic occurrences of Mesozoic and Tertiary megaspores. |
1989 |
| details |
Late Oligocene |
Late Miocene |
Nd |
Fowler,K. Megaspores and Massulae of Azolla prisca from the Oligocene of the Isle of Wight. |
1975 |
| details |
Tertiary |
|
USSR(Siberia) |
Batten,D.J. et al. Catalog of Mesozoic and Tertiary megaspores |
1990 |
| details |
Early Miocene |
|
Germany(Rhineland) |
Kempf,E.K. Electron microscopy of the sporoderm of Cenozoic megaspores of the water fern genus Azolla. |
1969 |
| details |
Miocene |
|
Canada(British Columbia) |
Hills,L.V. et al. Azolla primaeva and its phylogenetic significance. |
1967 |
| details |
Early Pliocene |
|
Nd |
Kedves,M. The present state of ultrastructural research into fossil sporomorphs. |
1973 |
| details |
Miocene |
|
USSR |
Friis,E.M. EM: Studies on Salviniaceae megaspores from the Middle Miocene Fasterholt Flora, Denmark. |
1977 |
| details |
Miocene |
|
Poland |
Friis,E.M. EM: Studies on Salviniaceae megaspores from the Middle Miocene Fasterholt Flora, Denmark. |
1977 |
| details |
Late Pliocene |
|
USSR(Siberia) |
Volkova,V.S. Stratigraphy and history of formation of vegetation of West Siberia in Late Cenozoic time. |
1977 |
| details |
Pliocene |
|
Nd |
Taylor,T.N. et al. In situ, pollen and spores in plant evolution. 14C -Importance of in situ, pollen and spores in understanding the biology and evolution of fossil plants. (Principles and Applications. Applications. J.Jansonius and D.C.McGregor, editors.) |
1996 |
| original |
Miocene |
|
USSR(Omskaya Oblast) |
Dorofeyev,P.I. On the taxonomy of the Tertiary Azolla Lam. of the section Rhizosperma Meyen |
1980 |
| original |
Miocene |
|
USSR(Omskaya Oblast) |
Dorofeyev,P.I. On the taxonomy of the Tertiary Azolla Lam. of the section Rhizosperma Meyen |
1980 |
| original |
Miocene |
|
USSR(Omskaya Oblast) |
Dorofeyev,P.I. On the taxonomy of the Tertiary Azolla Lam. of the section Rhizosperma Meyen |
1980 |
| original |
Miocene |
|
USSR(Tomskaya Oblast) |
Dorofeyev,P.I. On the taxonomy of the Tertiary Azolla Lam. of the section Rhizosperma Meyen |
1980 |
| details |
Early Miocene |
|
Germany(Rhineland) |
Kedves,M. Tranmission Electron Microscopy of the Fossil Spores. |
1996 |