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Pteridospermales

A Dictionary of Earth Sciences | 1999 | | Copyright

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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AILSA ALLABY and MICHAEL ALLABY. "Pteridospermales." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "Pteridospermales." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O13-Pteridospermales.html

AILSA ALLABY and MICHAEL ALLABY. "Pteridospermales." A Dictionary of Earth Sciences. 1999. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-Pteridospermales.html

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Pteridospermales

A Dictionary of Plant Sciences | 1998 | | Copyright

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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MICHAEL ALLABY. "Pteridospermales." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "Pteridospermales." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O7-Pteridospermales.html

MICHAEL ALLABY. "Pteridospermales." A Dictionary of Plant Sciences. 1998. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-Pteridospermales.html

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Pteridospermales

A Dictionary of Biology | 2004 | Copyright

Pteridospermales See Cycadofilicales.

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"Pteridospermales." A Dictionary of Biology. 2004. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>.

"Pteridospermales." A Dictionary of Biology. 2004. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O6-Pteridospermales.html

"Pteridospermales." A Dictionary of Biology. 2004. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O6-Pteridospermales.html

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Free newspaper and magazine articles

	SEEDS of WORRY.(Agriculture)(Dry weather and the empty Fern Ridge Lake have... Newspaper article from: The Register Guard (Eugene, OR); 4/10/2005
	Fern Genome Structure and Evolution.(2008 AFS SYMPOSIUM SUMMARY)(Report) Magazine article from: American Fern Journal; 4/1/2009
	Anatomy and development of the fern sporophyte.(Interpreting Botanical Progress) Magazine article from: The Botanical Review; 10/1/1995