Pteridospermatophyta

"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, others seem to be closer to angiosperms.

The seeds of seed ferns develope differently from the other seed plants, as they are believed to grow inside a cupule.

Orders often united in the seed ferns are:

• Arberiales
• Calamopityales
• Callistophytales
• Gigantopteridales (= "Gigantonomiales")
• Glossopteridales
• Leptostrobales
• Peltaspermales

External links

• Seed fern paleontology
• Seed ferns

This paleontology article is a stub. You can help Wikipedia by expanding it.

This plant article is a stub. Please help Wikipedia grow by expanding it.

This article is licensed under the GNU Free Documentation License. It uses material from Wikipedia