pteridospermn.

Brit.

/tᵻˈrɪdəspəːm/, U.S.

/təˈrɪdəˌspərm/,

/ˈtɛrədəˌspərm/

Origin: Formed within English, by compounding; modelled on a Latin lexical item. Etymons: pterido- comb. form, -sperm comb. form.

Etymology: < pterido- comb. form + -sperm comb. form, after scientific Latin Pteridospermae, former class name (F. Oliver & D. Scott 1904, in Proc. Royal Soc. 73 4). Compare French pteridospermées, plural noun (1909 or earlier), German Pteridospermen, plural noun (1913 or earlier).

Botany and Palaeontology.

Any of various extinct gymnosperms belonging to the division Pteridospermatophyta, which originated in the late Devonian period and became widespread towards the end of the Palaeozoic era, and resembled modern ferns in their leaves but unlike them produced seeds.

ΘΚΠ

the world > plants > particular plants > plants and herbs > fossil plants > [noun]

cycadite18..

Bothrodendron1835

lepidodendron1836

calamite1837

sphenophyllum1837

stigmaria1845

polyporite1846

fucoid1848

Muscites1859

lepidodendrid1863

Bennettites1871

lepidodendroid1872

progymnosperm1885

pteridosperm1904

Bennettitales1907

seed fern1907

1904 New Phytologist 3 131 We suppose the discovery of the ‘Pteridosperms’ is too recent for any account of them to appear in a work which has obviously been in course of elaboration for some time.

1905 F. Oliver & D. Scott in Philos. Trans. (Royal Soc.) B. 197 240 The further development of our knowledge of the Pteridosperms will form one of the chief objects of palæo-botanic investigation in the near future.

1931 A. C. Seward Plant Life through Ages ix. 147 Evidence..eventually proved that the great majority of the Carboniferous ‘ferns’ were seed-bearing plants—pteridosperms.

1974 G. W. Burns Plant Kingdom xix. 449/1 Ovules of the Paleozoic pteridosperm Medullosa were probably terminally attached on the pinnae.

2000 Paleogeogr., Paleoclimatol. & Paleoecol. 161 73/2 This feature was shared by several unrelated plant groups during the late Paleozoic (ferns, progymnosperms, pteridosperms and early cycads).

Derivatives

pteˌridoˈspermous adj. of, or relating to,or characteristic of a pteridosperm.

ΚΠ

1905 Proc. Royal Soc. B. 76 245 (title) A Type of pteridospermous seed from the Coal Measures.

1956 S. Haden-Guest et al. World Geogr. Forest Resources 29 There is considerable reason to believe that the poleward temperate regions of the time also supported at least a scattered assortment of pteridospermous types.

2000 Paleogeogr., Paleoclimatol. & Paleoecol. 161 74/1 This taxonomic assignment is based on the persistent presence of pteridospermous reproductive organs in the investigated floras.

This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).

单词	pteridosperm
释义	pteridospermn. Brit. /tᵻˈrɪdəspəːm/, U.S. /təˈrɪdəˌspərm/, /ˈtɛrədəˌspərm/ Origin: Formed within English, by compounding; modelled on a Latin lexical item. Etymons: pterido- comb. form, -sperm comb. form. Etymology: < pterido- comb. form + -sperm comb. form, after scientific Latin Pteridospermae, former class name (F. Oliver & D. Scott 1904, in Proc. Royal Soc. 73 4). Compare French pteridospermées, plural noun (1909 or earlier), German Pteridospermen, plural noun (1913 or earlier). Botany and Palaeontology. Any of various extinct gymnosperms belonging to the division Pteridospermatophyta, which originated in the late Devonian period and became widespread towards the end of the Palaeozoic era, and resembled modern ferns in their leaves but unlike them produced seeds. ΘΚΠ the world > plants > particular plants > plants and herbs > fossil plants > [noun] cycadite18.. Bothrodendron1835 lepidodendron1836 calamite1837 sphenophyllum1837 stigmaria1845 polyporite1846 fucoid1848 Muscites1859 lepidodendrid1863 Bennettites1871 lepidodendroid1872 progymnosperm1885 pteridosperm1904 Bennettitales1907 seed fern1907 1904 New Phytologist 3 131 We suppose the discovery of the ‘Pteridosperms’ is too recent for any account of them to appear in a work which has obviously been in course of elaboration for some time. 1905 F. Oliver & D. Scott in Philos. Trans. (Royal Soc.) B. 197 240 The further development of our knowledge of the Pteridosperms will form one of the chief objects of palæo-botanic investigation in the near future. 1931 A. C. Seward Plant Life through Ages ix. 147 Evidence..eventually proved that the great majority of the Carboniferous ‘ferns’ were seed-bearing plants—pteridosperms. 1974 G. W. Burns Plant Kingdom xix. 449/1 Ovules of the Paleozoic pteridosperm Medullosa were probably terminally attached on the pinnae. 2000 Paleogeogr., Paleoclimatol. & Paleoecol. 161 73/2 This feature was shared by several unrelated plant groups during the late Paleozoic (ferns, progymnosperms, pteridosperms and early cycads). Derivatives pteˌridoˈspermous adj. of, or relating to,or characteristic of a pteridosperm. ΚΠ 1905 Proc. Royal Soc. B. 76 245 (title) A Type of pteridospermous seed from the Coal Measures. 1956 S. Haden-Guest et al. World Geogr. Forest Resources 29 There is considerable reason to believe that the poleward temperate regions of the time also supported at least a scattered assortment of pteridospermous types. 2000 Paleogeogr., Paleoclimatol. & Paleoecol. 161 74/1 This taxonomic assignment is based on the persistent presence of pteridospermous reproductive organs in the investigated floras. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.1904
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