Cyathotrachus altissimus
- Citations total:
- 3
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| original | Desmoinesian | Iowa | Mamay,S.H. Some American Carboniferous fern fructifications. | 1950 | |
| details | Pennsylvanian | Iowa | Potonie,R. Synopsis of the Sporae in situ. | 1962 | |
| details | Carboniferous | USA | Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. | 1995 |