Progymnospermophyta
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| Progymnospermophyta Fossil range: Middle Devonian to Mississipian |
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| Archaeopteris | |
| Scientific classification | |
| Kingdom: | Plantae |
| Subkingdom: | Embryophyta |
| Division: | †Progymnospermophyta |
| Class: | †Progymnospermopsida |
| Orders | |
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Progymnospermophyta is an extinct division of Paleozoic plants. Its sole class is Progymnospermopsida.
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.
- Superficially conifer/spruce-like in appearance.
- Strong monopodial growth is exhibited.
- Macrophylls present as well as simple leaves.
- Some were heterosporous but others were homosporous.
External links
- Progymnospermophyta
- http://books.google.com/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
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