- pteridosperm
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Any of various extinct gymnosperms, of the division Pteridospermatophyta, resembling ferns, but producing seeds instead of spores
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pteridosperm
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pteridosperm — [ter′i dōspʉrm΄] n. SEED FERN … English World dictionary
pteridosperm — noun Etymology: International Scientific Vocabulary Date: 1904 seed fern … New Collegiate Dictionary
pteridosperm — /teuh rid euh sperrm , ter i doh /, n. See seed fern. [1900 05; < NL Pteridospermales the order; see PTERIDO , SPERM1, ALES] * * * … Universalium
pteridosperm — [ tɛrɪdə(ʊ)spə:m] noun a fossil plant intermediate between the ferns and seed bearing plants, dying out in the Triassic period. Origin early 20th cent.: from mod. L. pteridospermeae, from Gk pteris, pterid fern … English new terms dictionary
pteridosperm — pte·rido·sperm … English syllables
pteridosperm — pte•rid•o•sperm [[t]təˈrɪd əˌspɜrm, ˈtɛr ɪ doʊ [/t]] n. pln seed fern • Etymology: 1900–05; < NL Pteridospermales the order; see pterido , sperm I, ales … From formal English to slang
pteridosperm — noun an extinct seed producing fernlike plant of the order Cycadofilicales (or group Pteridospermae) • Syn: ↑seed fern • Hypernyms: ↑gymnosperm … Useful english dictionary
seed fern — noun an extinct seed producing fernlike plant of the order Cycadofilicales (or group Pteridospermae) • Syn: ↑pteridosperm • Hypernyms: ↑gymnosperm * * * noun : a plant or fossil of the order Cycadofilicales : pteridosperm * * * any of various… … Useful english dictionary
Coal forest — Etching depicting some of the most significant plants of the Carboniferous. Coal forests were the vast swathes of wetlands that extended over much of the tropical land areas during late Carboniferous (Pennsylvanian) and Permian times.[1 … Wikipedia
Evolutionary history of plants — Plants have evolved through increasing levels of complexity, from the earliest algal mats, through bryophytes, lycopods, ferns and gymnosperms to the complex angiosperms of today. While the simple plants continue to thrive, especially in the… … Wikipedia
