Progymnosperm

Progymnosperms are ancient plants that don't exist anymore. They were like woody plants with spores and probably came from trimerophytes. Later, they led to the development of gymnosperms, which are the ancestors of acrogymnosperms and angiosperms (flowering plants). People sometimes call them Progymnospermophyta or Progymnospermopsida.

References

Other websites
Progymnospermophyta 
Botany: an introduction to plant biology

Category:Seed plants
Category:Fossil plants
Category:Extinct plants