medullosanadj.n.

Brit.

/ˌmɛdəˈləʊsn/, U.S.

/ˌmɛdəˈloʊs(ə)n/

Forms: also with capital initial.

Origin: Formed within English, by derivation. Etymons: Medullosa n., -an suffix.

Etymology: < Medullosa n. + -an suffix. Compare earlier medullosean adj.

Botany.

A. adj.

Of, relating to, or belonging to the group of extinct seed-bearing ferns (pteridosperms) including the genus Medullosa, known from Carboniferous and Permian fossils, whose stems have large, widely-spaced petioles and branched vascular cylinders.

ΘΚΠ

the world > plants > particular plants > ferns > [adjective] > of or belonging to group or type of fern

polypodiaceous1818

osmundaceous1842

marsileaceous1857

salviniaceous1858

anadromous1881

pteridophytic1883

homophyadic1889

medullosean1899

trichomanoid1900

medullosan1903

resam1939

heterophyadic-

1903 Philos. Trans. (Royal Soc.) B. 195 136 Potonié is of the opinion that the modern Cycads arose from Medullosan ancestors.

1917 A. C. Seward Fossil Plants III. xxx. 86 There is..little doubt that other forms of leaves, such as Odontopteris and possibly Taeniopteris, were borne on Medullosan stems.

1956 Bot. Rev. 22 77 At present there is difficulty in deriving cycadean male fructifications from medullosan pollen-bearing organs.

1972 Amer. Jrnl. Bot. 59 663 (heading) The structure of medullosan rooting systems.

1992 M. Ingrouille Diversity & Evol. Land Plants 79 The living gymnosperms, the true cycads, Cycadales..probably evolved from the medullosan seed ferns of the Lower Permian.

B. n.

A seed-bearing fern of the extinct genus Medullosa or the group to which it belongs.

ΘΚΠ

the world > plants > particular plants > ferns > [noun] > fossil ferns

sphenopteris1837

wedge-leaf fern1851

wedge-fern1867

glossopteris1883

Medullosa1885

medullosan1920

1920 Amer. Jrnl. Bot. 7 164 As a floral type it finds place somewhere amongst the Medullosans.

1947 C. A. Arnold Introd. Paleobot. ix. 226 In these respects the Anglorota medullosans stand out more or less in contrast to the Permian species.

1981 Rev. Palaeobot. & Palynol. 32 64 Basinger et al...have presented convincing evidence that medullosans are indeed monostelic.

1993 New Scientist 6 Feb. 34/1 The earliest evidence for the synthesis of resin comes from tropical forests in the late Carboniferous period, about 310 million years ago. Cordaitalean conifers and possibly the seed ferns (Medullosans)..together constituted the bulk of these forests.

This is a new entry (OED Third Edition, June 2001; most recently modified version published online March 2022).

单词	medullosan
释义	medullosanadj.n. Brit. /ˌmɛdəˈləʊsn/, U.S. /ˌmɛdəˈloʊs(ə)n/ Forms: also with capital initial. Origin: Formed within English, by derivation. Etymons: Medullosa n., -an suffix. Etymology: < Medullosa n. + -an suffix. Compare earlier medullosean adj. Botany. A. adj. Of, relating to, or belonging to the group of extinct seed-bearing ferns (pteridosperms) including the genus Medullosa, known from Carboniferous and Permian fossils, whose stems have large, widely-spaced petioles and branched vascular cylinders. ΘΚΠ the world > plants > particular plants > ferns > [adjective] > of or belonging to group or type of fern polypodiaceous1818 osmundaceous1842 marsileaceous1857 salviniaceous1858 anadromous1881 pteridophytic1883 homophyadic1889 medullosean1899 trichomanoid1900 medullosan1903 resam1939 heterophyadic- 1903 Philos. Trans. (Royal Soc.) B. 195 136 Potonié is of the opinion that the modern Cycads arose from Medullosan ancestors. 1917 A. C. Seward Fossil Plants III. xxx. 86 There is..little doubt that other forms of leaves, such as Odontopteris and possibly Taeniopteris, were borne on Medullosan stems. 1956 Bot. Rev. 22 77 At present there is difficulty in deriving cycadean male fructifications from medullosan pollen-bearing organs. 1972 Amer. Jrnl. Bot. 59 663 (heading) The structure of medullosan rooting systems. 1992 M. Ingrouille Diversity & Evol. Land Plants 79 The living gymnosperms, the true cycads, Cycadales..probably evolved from the medullosan seed ferns of the Lower Permian. B. n. A seed-bearing fern of the extinct genus Medullosa or the group to which it belongs. ΘΚΠ the world > plants > particular plants > ferns > [noun] > fossil ferns sphenopteris1837 wedge-leaf fern1851 wedge-fern1867 glossopteris1883 Medullosa1885 medullosan1920 1920 Amer. Jrnl. Bot. 7 164 As a floral type it finds place somewhere amongst the Medullosans. 1947 C. A. Arnold Introd. Paleobot. ix. 226 In these respects the Anglorota medullosans stand out more or less in contrast to the Permian species. 1981 Rev. Palaeobot. & Palynol. 32 64 Basinger et al...have presented convincing evidence that medullosans are indeed monostelic. 1993 New Scientist 6 Feb. 34/1 The earliest evidence for the synthesis of resin comes from tropical forests in the late Carboniferous period, about 310 million years ago. Cordaitalean conifers and possibly the seed ferns (Medullosans)..together constituted the bulk of these forests. This is a new entry (OED Third Edition, June 2001; most recently modified version published online March 2022). < adj.n.1903
随便看	θ209174 θ209175 θ209176 θ209177 θ209178 θ209179 θ213445 θ213446 θ213447 θ213448 θ213449 θ21345 θ213450 θ213451 θ213452 θ213453 θ213454 θ213455 θ213456 θ213457 θ213458 θ213459 θ21346 θ213460 θ213461