Pteridospermatophyta, also called seed ferns, is an extinct gymnosperm division of the Plantaekingdom. Members of this division were predominant at the late Devonian. For now, the Pteridospermatophyta have not acquired a clear position in the botanical systematic yet. Scientific classification - Wikipedia /**/ @import /skins/monobook/IE50Fixes. ... Kingdoms Eukaryotes are organisms with complex cells, in which the genetic material is organized into membrane-bound nuclei. ... Divisions Green algae land plants (embryophytes) non-vascular embryophytes Hepatophyta - liverworts Anthocerophyta - hornworts Bryophyta - mosses vascular plants (tracheophytes) seedless vascular plants Lycopodiophyta - clubmosses Equisetophyta - horsetails Pteridophyta - true ferns Psilotophyta - whisk ferns Ophioglossophyta - adderstongue ferns seed plants (spermatophytes) †Pteridospermatophyta - seed ferns Pinophyta - conifers Cycadophyta - cycads Ginkgophyta - ginkgo Gnetophyta - gnetae Magnoliophyta - flowering... Gymnosperms are seed-bearing, vascular plants. ... Divisions Green algae land plants (embryophytes) non-vascular embryophytes Hepatophyta - liverworts Anthocerophyta - hornworts Bryophyta - mosses vascular plants (tracheophytes) seedless vascular plants Lycopodiophyta - clubmosses Equisetophyta - horsetails Pteridophyta - true ferns Psilotophyta - whisk ferns Ophioglossophyta - adderstongue ferns seed plants (spermatophytes) †Pteridospermatophyta - seed ferns Pinophyta - conifers Cycadophyta - cycads Ginkgophyta - ginkgo Gnetophyta - gnetae Magnoliophyta - flowering... In politics, a country (or in some cases, a group of countries) over which a king or queen reigns, is a kingdom, see: monarchy. ... The Devonian is a major division of the geologic timescale that extends from the end of the Silurian period (360 million years ago (mya)) to the beginning of the Mississippian subperiod of the Carboniferous (408. ...
See also: Glossopteris, Spermatophyte Order is the opposite of anarchy and chaos. ... Glossopteris (Greek glossa, meaning tongue, because the leaves were tongue-shaped) is the largest and best-known genus of the extinct order of seed ferns known as Glossopteridales. ... The spermatophytes comprise those plants that produce seeds. ...
Name: Pteridospermatophyta seed, which is the "seed" or "megaspore" of the seed fern Neuropteris
Most notable were the seed ferns (or the Pteridospermatophyta, that, like their close relatives, the cycads, did not reproduce very frequently, but when they did, it was by means of large seeds.
The extant descendents of the extinct Pteridospermatophyta practice sex with spores, Fossil fern fruits have also been called "petrified pecan nuts" because of their superficial resemblance to modern pecans.
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