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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.

Subjects: Earth Sciences and Geography.

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