| original |
Middle Pennsylvanian |
|
Illinois |
Arnold,C.A. Note on a Lepidophyte strobilus containing large spores, from Braidwood, Illinois. |
1938 |
| details |
Carboniferous |
|
Illinois |
Potonie,R. Synopsis of the Sporae in situ. |
1962 |
| details |
Recent |
|
Nd |
Potonie,R. Position of the Paleozoic spore genera in the natural system. |
1954 |
| details |
Middle Pennsylvanian |
|
Illinois |
Arnold,C.A. An Introduction to Paleobotany. |
1947 |
| details |
Paleozoic |
|
Nd |
Potonie,R. The spores of Palaeozoic plants in the natural (Morphologic) system |
1954 |
| details |
Carboniferous |
|
USA |
Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. |
1995 |