Calamopityaceae is the largest family of the division of extinct seed-bearing plants known as Pteridospermatophyta. It is the only family in the monotypic order Calamopityales. This family is characte

Pteridosperms, also known as seed ferns, are a polyphyletic grouping of extinct seed-producing plants. The earliest fossil evidence for plants of this type are the lyginopterids of late Devonian age.