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Author - title
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Year
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| details | Late Cretaceous | Recent | Nd | Bergad,R.D. An ultrastructural comparison of walls of living and fossil Salviniaceous and Marsileaceous megaspores | 1972 |
| details | Nd | Nd | Bergad,R.D. Ultrastructure of living and fossil Salviniaceous megaspores. | 1974 | |
| details | Maastrichtian | North Dakota | Bergad,R.D. Palynology of the Hell Creek Formation (Maastrichtian) in South-Central North Dakota. | 1974 | |
| details | Maastrichtian | Canada(Alberta) | Batten,D.J. et al. Catalog of Mesozoic and Tertiary megaspores | 1990 |