Protopteridium thomsonii
- Citations total:
- 2
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| details | Middle Devonian | Belgium | Potonie,R. Examples of the natural system of spores, a supplement to the synopsis of the Sporae in situ, 1963 and the research reports from 1965,1967, and 1970 and to the phylogenetic sporolog 1973 | 1975 | |
| details | Devonian | USA | Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. | 1995 |