The Pteridospermales or Cycadofilicales are characteristic gymnospermous plants that bore fern-like foliage, which in turn bore seeds that were unprotected. Hence, they are known as seed ferns. Pteridospermales is a…
The Bennettitales (Cycadeoidales) are a fossil group found from the Triassic to the lower Cretaceous, but were predominant in the Jurassic period of the Mesozoic era in South America, North…
Gnetales is an order of the gymnospermic seed plants. This order is composed of three genera- Gnetum, Ephedra, and Welwitschia. Chamberlain (1935) has placed all three genera in a single-family…
Coniferales is a gymnospermic order like Ginkgoales. The members of this order form the common conifers. The order Coniferales includes both fossil and present-day living genera. The Coniferales reached their…
Ginkgoales is a special gymnospermic order having one living genus (Ginkgo biloba). The members of this order once had an almost worldwide distribution in the Jurassic period. The fossil members…
Cycadales is a gymnospermic order. Members of this order are mostly inhabitants of tropical and subtropical regions. Cycadales include both living and fossil genera. They originated in the Mesozoic era…