The term seed ferns (Pteridospermatophyta) are several distinct groups of extinct seed plants (spermatophytes).

The oldest fossil evidence of plants of this type is from Upper Devonian strata, and they flourished particularly during the Carboniferous and Permian periods.

Pteridosperms declined during the Mesozoic Era and had mostly disappeared by the end of the Cretaceous, though some fossil pteridosperm-like plants seem to have survived into Eocene times in Tasmania.
The term seed ferns (Pteridospermatophyta) are several distinct groups of extinct seed plants (spermatophytes).
The oldest fossil evidence of plants of this type is from Upper Devonian strata, and they flourished particularly during the Carboniferous and Permian periods.
Pteridosperms declined during the Mesozoic Era and had mostly disappeared by the end of the Cretaceous, though some fossil pteridosperm-like plants seem to have survived into Eocene times in Tasmania.
Seed fern