pteridosperm

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Related to Pteridosperms: Cordaites, Pteridospermatophyta

pteridosperm

(ˈtɛrɪdəˌspɜːm)
n
1. (Plants) any extinct seed-producing fernlike plant of the group Pteridospermae. Also called: seed fern
2. (Palaeontology) any extinct seed-producing fernlike plant of the group Pteridospermae. Also called: seed fern
[C19: from Greek pteris a fern + -sperm]

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.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)
gymnosperm - plants of the class Gymnospermae having seeds not enclosed in an ovary
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Among different plant groups Pteridosperms were also trying to coope with theenvironment as shown by their morphographic features like radial monosaccate construction helpful in floating of pollen during dispesal , leathery saccus construction and saccus enclosing the corpus from all sides for the protection of microgametophte .
Evidence for pollination-drop mechanism in Paleozoic pteridosperms.
8h) with minor contributions from lycopsids (Lepidodendron and Lepidophloios), sphenopsids (Calamites), and possible tree ferns and pteridosperms (Ielpi et al.
How Paleozoic Vines and Lianas Got off the Ground: On Scrambling and Climbing Carboniferous-Early Permian Pteridosperms.
1988, Stewart & Rothwell 1993): spermatophytes (seed plants comprising the extant gymnosperms and angiosperms and few extinct groups, being the Pteridosperms the most prominent one) and monilophytes (ferns sensu stricto).
Pteridosperms are the backbone of seed-plant phylogeny.
The equatorial flora that existed in the watery environments of the Carboniferous Period, for example, included Pteridosperms (Pecopteris, Neuropteris, etc.
Evidence for a pollination-drop mechanism in Paleozoic pteridosperms.
Pteridosperms, or seed-ferns, were one of the most diverse and widespread elements of Late Paleozoic tropical rainforests (DiMichele et al.
The plants essentially belong to callipterid pteridosperms and conifers; in addition, possible cycads and problematic specimens of calamites and ferns must be mentioned.
Late Gzhelian pteridosperms with callipterid foliage of the Donets Basin, Ukraine.
The floral remains confirm a humid environment which favoured lycopsids, sphenopsids, ferns, and less common pteridosperms.