Heterotheca
- Citations total:
- 2
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| details | Nd | Nd | Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. | 1995 | |
| details | Carboniferous | Permian | Nd | Remy,W. Monosaccate pteridospermous pollen of the Carboniferous and Permian as well as general considerations of Paleozoic pollen with air sacs. | 1954 |