| original |
Carboniferous |
Permian |
Europe |
Remy,W. Investigations on some fructifications of ferns and Pteridosperms from the Carboniferous and Permian of Middle Europe. |
1953 |
| 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 |
| details |
Nd |
|
Nd |
Potonie,R. Position of the Paleozoic spore genera in the natural system. |
1954 |
| details |
Nd |
|
Nd |
Remy,W. The systematics of the Pteridosperms including consideration of their pollen. |
1953 |
| details |
Late Carboniferous |
|
Europe |
Remy,W. et al. Plant fossils |
1959 |
| details |
Namurian A |
|
Nd |
Potonie,R. Main trends in the evolution of spores. |
1971 |