Speciososporites |
Speciososporites
|
Nd |
Recent |
|
Spencerites |
Spencerites
|
Nd |
Nd |
|
Sphaerostoma |
Sphaerostoma ovale
|
Nd |
Nd |
|
Sphenophyallales |
Sphenophyallales
|
Nd |
Recent |
|
Sphenophyllostachys |
Sphenophyllostachys dawsoni
|
Nd |
Nd |
|
Sphenophyllostachys |
Sphenophyllostachys majus
|
Nd |
Nd |
|
Sphenophyllum |
Sphenophyllum
|
Nd |
Nd |
|
Sphenophyllum |
Sphenophyllum dawsoni
|
Nd |
Nd |
|
Sphenophyllum |
Sphenophyllum fertile
|
Nd |
Nd |
|
Sphenopsida |
Sphenopsida
|
Nd |
Recent |
|
Sphenopteris |
Sphenopteris
|
Nd |
Nd |
|
Sphenopteris |
Sphenopteris hoeninghausi
|
Nd |
Nd |
|
Sphenostrobus |
Sphenostrobus thompsonii
|
Iowa |
Desmoinesian |
|
Sporangiostrobus |
Sporangiostrobus rugosus
|
Nd |
Nd |
|
Stephanospermum |
Stephanospermum
|
Nd |
Nd |
|
Superbisporites |
Superbisporites
|
Nd |
Recent |
|
Svalbardella |
Svalbardella polymorpha
|
Nd |
Nd |
|