| details |
Emsian |
|
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 |
Early Devonian |
|
Canada |
Gensel,P.G. et al. On the spores of Psilophyton. |
1980 |
| original |
Early Devonian |
|
Canada(New Brunswick) |
Gensel,P.G. Two Psilophyton species from the Lower Devonian of eastern Canada with a discussion of morphological variation Wihin the genus. |
1979 |
| details |
Early Devonian |
|
Canada |
Pflug,H.D. et al. Need English |
1991 |
| details |
Devonian |
|
Nd |
Gensel,P.G. Devonian in situ, spores: A survey and discussion. |
1980 |
| details |
Devonian |
|
Canada |
Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. |
1995 |