| details |
Late Mississippian |
Permian |
Nd |
Millay,M.A. et al. Paleozoic seed fern pollen organs. |
1979 |
| details |
Nd |
|
Nd |
Potonie,R. Fossil sporae in situ. Comparison with the sporae dispersae. Addition to the synopsis of the sporae in situ. |
1965 |
| 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 |
Carboniferous |
|
Nd |
Potonie,R. The spores of Palaeozoic plants in the natural (Morphologic) system |
1954 |