Scientific name: Pteridospermatopsida
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Vietnamese name: Dương xỉ cỏ hạt
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"Pteridospermatophyta", also called seed ferns, is an extinct spermatophyte group of the Plantae kingdom. Members of this division were predominant at the late Devonian, declined some 250 mya, and disappeared in the Cretaceous. The Pteridospermatophyta have not yet acquired a clear position in botanical systematics and indeed appear to be a paraphyletic form taxon. Some appear to be allied or ancestral to the gymnosperms.