| original |
Late Devonian |
|
Canada(Quebec) |
Chaloner,W.G. et al. A seed megaspore from the Devonian of Canada. |
1964 |
| details |
Late Devonian |
|
Canada(Quebec) |
Hemsley,A.R. The ultrastructure of the exine of the megaspores in two Paleozoic seed-likestructures |
1990 |
| details |
Frasnian |
|
England(Bedfordshire) |
Mortimer,M.G. et al. Devonian megaspores from the Wyboston borehole, Bedfordshire, England |
1967 |
| details |
Frasnian |
|
Nd |
Pettitt,J.M. Heterospory and the Rise of the seed Habit. |
1969 |
| details |
Early Carboniferous |
|
Scotland(Berwick) |
Long,A.G. Some specimens of Mazocarpon, Achlamydocarpon and Cystosporites from the Lower Carboniferous rocks of Berwickshire |
1968 |
| details |
Late Devonian |
|
Nd |
Gensel,P.G. et al. Early land plant debris (Hooker's "Waifs and Stray"?) |
1990 |
| details |
Nd |
|
Nd |
Edwards,D. et al. In situ, pollen and spores in plant evolution. 14A -Review of in situ, spores in early land plants. (Principles and Applications. Applications. J.Jansonius and D.C.McGregor, editors.) |
1996 |
| details |
Late Devonian |
|
Canada(Quebec) |
Chaloner,W.G. et al. Heterospory: Cul-de-Sac or pathway to the seed? (In: Pollen and Spores, Patterns of Diversification. S.Blackmore and S.H.Barnes, editors) |
1991 |