| details |
Nd |
|
Nd |
Stidd,B.M. et al. The reproductive organs of Callistophyton. |
1970 |
| details |
Nd |
|
Nd |
Chaloner,W.G. The evolution of adaptive features in fossil exines. |
1976 |
| details |
Middle Pennsylvanian |
Late Pennsylvanian |
Nd |
Millay,M.A. et al. Paleozoic seed fern pollen organs. |
1979 |
| details |
Pennsylvanian |
|
USA |
Rothwell,G.W. The Callistophytales (Pteridospermopsida). |
1981 |
| details |
Permian |
|
USA |
Rothwell,G.W. The Callistophytales (Pteridospermopsida). |
1981 |
| details |
Virgilian |
|
New Mexico |
Willard,D.A. Early Virgilian palynofloras from the Kinney Quarry, Manzanita Mountains, Central New Mexico. |
1991 |
| details |
Nd |
|
Nd |
Taylor,T.N. et al. In situ, pollen and spores in plant evolution. 14C -Importance of in situ, pollen and spores in understanding the biology and evolution of fossil plants. (Principles and Applications. Applications. J.Jansonius and D.C.McGregor, editors.) |
1996 |