| original |
Middle Pennsylvanian |
|
Illinois |
Millay,M.A. Studies of Paleozoic Marattialeans |
1979 |
| original |
Middle Pennsylvanian |
|
Kansas |
Millay,M.A. Studies of Paleozoic Marattialeans |
1979 |
| details |
Middle Pennsylvanian |
Late Pennsylvanian |
Illinois |
Millay,M.A. et al. The ultrastructure of Paleozoic fern spores. II. Scolecopteris (Marattiales) |
1984 |
| details |
Carboniferous |
|
USA |
Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. |
1995 |
| details |
Middle Pennsylvanian |
Late Pennsylvanian |
Illinois |
Kedves,M. Tranmission Electron Microscopy of the Fossil Spores. |
1996 |