pteridosperm

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Related to Pteridosperms: Cordaites, Pteridospermatophyta
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Synonyms for pteridosperm

an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae)

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References in periodicals archive ?
In an important paper, Wnuk and Pfefferkorn (1984) described parautochthonous assemblages of medullosan pteridosperms from Pennsylvania, USA.
More than 95% of this plant material comprises remains of medullosan pteridosperms, including trunks [less than or equal to] 95 mm in diameter that show resin rodlets and downward-recurved petioles, large bifurcating petioles [less than or equal to] 56 mm in diameter, and pinnae of Macroneuropteris scheuchzeri with cyclopterid pinnules, and Neuropteris ovata.
The presence of a fossil flora consisting of sphenopsids, lycopsids, cordaitaleans, a varied suite of ferns (including tree fragments), and more occasional pteridosperms, is indicative of a humid environment.
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).
From this Psilophyton-like type were derived two lines of evolution--the lycopods, on the one hand, which retained their phylloids and dichotomous cauloids, and, on the other, all other vascular cryptogams, the pteridosperms, all gymnosperms and angiosperms.
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).
DiMichele and Phillips (1977) described the monocyclic Psaronius simplicicaulis from an Early Pennsylvanian bedrock valley-fill succession in Illinois (Leary 1981), where it was associated with an upland/dryland assemblage of cordaitaleans, pteridosperms, and noeggerathialians (Leary 1975, 1993).
Seasonal dryland environments were apparently colonised by ecologically stressed, fire-prone vegetation dominated by cordaitaleans and medullosan pteridosperms (Falcon-Lang 2003a, 2003b), and additionally supported a low-diversity fauna of invertebrates and tetrapods (Hebert and Calder 2004; Falcon-Lang et al.
Pteridosperms form a heterogeneous group of gymnospermous plants with fernlike foliage and were widely distributed during the late Paleozoic.
Literature on medullosalean pteridosperms, in contrast with other studied groups of Carboniferous plants, is very large and reflects a most intensively investigated Palaeozoic plant group.
Several fossil and extant cycad leaves show an external morphology similar to that of Bennettitales and Pteridosperms.
This assemblage represents fire in lowland peat-forming communities dominated by Sigillaria and medullosan pteridosperms.