seed fern


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Related to seed fern: ginkgo

seed fern

n
(Plants) another name for pteridosperm

seed′ fern`


n.
any of various fossil plants of the order Lyginopteridales (or Cycadofilicales) that had fernlike leaves and reproduced by means of seeds. Also called pteridosperm.
[1925–30]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.seed fern - an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae)seed fern - an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae)
gymnosperm - plants of the class Gymnospermae having seeds not enclosed in an ovary
References in periodicals archive ?
The discovery of fossilized stumps of Glossopteris, a seed fern now extinct, supports the view that during the Permian period - years 250-280,000,000 ago - Antarctica had a climate much warmer than it does today, according to Edith Taylor, a research scientist with Ohio State University's Byrd Polar Research Center.
Flowering plants evolved from extinct plants related to conifers, ginkgos, cycads, and seed ferns. The oldest known fossils from flowering plants are pollen grains.
Specific topics encompass the paleobotany of Livingston Island, Antarctica; targeted isolation and sequence assembly and characterization of the white spruce; the complete chloroplast genome sequence of a tree fern; reverse genetic analyses of gene function in fern gametophytes; glossopterid seed ferns from the Late Permian period; pollen development; DNA barcoding in the Cycadales; expressed sequence tag analysis in Ginkgo biloba; frequent fires in ancient shrub tundra; the history of native plant communities in the South; past vegetation patterns of New Mexico's Rio Del Oso Valley; and East Asian monsoon and paleoclimatic data analysis.
Paleozoic seed ferns. Paleobotany, Biology and Evolution of Fossil Plants: 529-619.