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Pteridospermales

Pteridospermales (seed ferns) Extinct gymnosperm order, which were the earliest seed plants and flourished in the Carboniferous, before disappearing in the Cretaceous. Their foliage was fern-like in appearance, but the fertile leaves bore seeds and pollen-producing organs. The first plant to be identified (in 1903) as a seed plant rather than a true fern was Lyginopteridales oldhamia.

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"Pteridospermales." A Dictionary of Earth Sciences. . Encyclopedia.com. 16 Aug. 2017 <http://www.encyclopedia.com>.

"Pteridospermales." A Dictionary of Earth Sciences. . Encyclopedia.com. (August 16, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/pteridospermales

"Pteridospermales." A Dictionary of Earth Sciences. . Retrieved August 16, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/pteridospermales

Pteridospermales

Pteridospermales (seed ferns) An extinct gymnosperm order, containing the earliest seed plants, which flourished in the Carboniferous, before disappearing in the Cretaceous.

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"Pteridospermales." A Dictionary of Plant Sciences. . Encyclopedia.com. 16 Aug. 2017 <http://www.encyclopedia.com>.

"Pteridospermales." A Dictionary of Plant Sciences. . Encyclopedia.com. (August 16, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/pteridospermales-0

"Pteridospermales." A Dictionary of Plant Sciences. . Retrieved August 16, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/pteridospermales-0

Pteridospermales

Pteridospermales See Cycadofilicales.

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"Pteridospermales." A Dictionary of Biology. . Encyclopedia.com. 16 Aug. 2017 <http://www.encyclopedia.com>.

"Pteridospermales." A Dictionary of Biology. . Encyclopedia.com. (August 16, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/pteridospermales-1

"Pteridospermales." A Dictionary of Biology. . Retrieved August 16, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/pteridospermales-1