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pteridosperm
(redirected from Pteridosperms)

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pteridosperm [ˈtɛrɪdəˌspɜːm]
n
(Life Sciences & Allied Applications / Plants) (Earth Sciences / Palaeontology) any extinct seed-producing fernlike plant of the group Pteridospermae Also called seed fern
[from Greek pteris a fern + -sperm]
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.pteridosperm - an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae)pteridosperm - an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae)
seed fern
gymnosperm - plants of the class Gymnospermae having seeds not enclosed in an ovary
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It is probable that a considerable measure of agreement could be obtained for the thesis that ferns and' pteridosperms developed from similar Psilophyton-like ancestors with terminal fertile telomes'.
The telome theory by Wilson, Carl L. / The Botanical Review
Drifted lycopsid plants predominate in the basal limestones, whereas overlying siltstones and sandstones contain a mixed suite of drifted gymnosperms (cordaitaleans), sphenopsids (primarily calamiteans), pteridosperms and putative progymnosperms (Falcon-Lang 2003a).
The Pennsylvanian Joggins Formation of Nova Scotia: sedimentological ... by Davies, S.J.; Gibling, M.R.; Rygel, M.C.; Calder, J.H.; Skilliter, D.M. / Atlantic Geology
Medullosan pteridosperms and cordaitaleans were assisted through dry periods by a substantial root system, which allowed them to tap deep groundwater sources (Falcon-Lang and Bashforth 2004).
Stratigraphy and sedimentology of early Pennsylvanian red beds at ... by Calder, John H.; Rygel, Michael C.; Ryan, R.J.; Falcon-Lang, Howard J.; Hebert, Brian L. / Atlantic Geology
 
 
 
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