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- Progymnosperm abstract "The progymnosperms are an extinct group of woody, spore-bearing plants that is presumed to have evolved from the trimerophytes, and eventually gave rise to the gymnosperms. They have been treated formally at the rank of division Progymnospermophyta or class Progymnospermopsida (as opposite). The stratigraphically oldest known examples belong to the Middle Devonian order the Aneurophytales, with forms such as Protopteridium, in which the vegetative organs consisted of relatively loose clusters of axes. Tetraxylopteris is another example of a genus lacking leaves. In more advanced aneurophytaleans such as Aneurophyton these vegetative organs started to look rather more like fronds, and eventually during Late Devonian times the anuerophytaleans are presumed to have given rise to the pteridosperm order, the Lyginopteridales. In Late Devonian times, another group of progymnosperms gave rise to the first really large trees known as Archaeopteris.Other characteristics:Vascular cambium with unlimited growth potential is present as well as xylem and phloem.Ancestors of the earliest seed plants as well as the first true trees.Strong monopodial growth is exhibited.Some were heterosporous but others were homosporous.↑ ↑ ↑".
- Progymnosperm thumbnail Archaeopteris.JPG?width=300.
- Progymnosperm wikiPageExternalLink books?id=0DfYJsVRmUcC&pg=PA723&lpg=PA723&dq=Progymnospermophyta&source=bl&ots=8gLDGKNZ3U&sig=K86Hb_ITkTlATOtMQpJrByaMx3w&hl=en&sa=X&oi=book_result&resnum=7&ct=result.
- Progymnosperm wikiPageExternalLink default.htm.
- Progymnosperm wikiPageID "8857956".
- Progymnosperm wikiPageRevisionID "544965393".
- Progymnosperm hasPhotoCollection Progymnosperm.
- Progymnosperm imageCaption "Archaeopteris fossil leaves".
- Progymnosperm subdivision "*Aneurophytales *Protopityales *Archaeopteridales".
- Progymnosperm subdivisionRanks "Orders".
- Progymnosperm taxon "Progymnospermopsida".
- Progymnosperm subject Category:Devonian_life.
- Progymnosperm subject Category:Plants.
- Progymnosperm comment "The progymnosperms are an extinct group of woody, spore-bearing plants that is presumed to have evolved from the trimerophytes, and eventually gave rise to the gymnosperms. They have been treated formally at the rank of division Progymnospermophyta or class Progymnospermopsida (as opposite).".
- Progymnosperm label "Pranagozalążkowe".
- Progymnosperm label "Progymnosperm".
- Progymnosperm label "Progymnospermen".
- Progymnosperm label "Progymnospermes".
- Progymnosperm label "Progymnospermophyta".
- Progymnosperm label "Progymnospermophyta".
- Progymnosperm label "前裸子植物門".
- Progymnosperm sameAs Progymnospermen.
- Progymnosperm sameAs Progymnospermophyta.
- Progymnosperm sameAs Progymnospermes.
- Progymnosperm sameAs Progymnospermophyta.
- Progymnosperm sameAs Pranagozalążkowe.
- Progymnosperm sameAs m.0403pq6.
- Progymnosperm sameAs Q2032825.
- Progymnosperm sameAs Q2032825.
- Progymnosperm wasDerivedFrom Progymnosperm?oldid=544965393.
- Progymnosperm depiction Archaeopteris.JPG.
- Progymnosperm isPrimaryTopicOf Progymnosperm.
