Tracheophyta
Some algal classes may have risen separately from others. Red algae may have come from blue-greens and others from the greens. Fungi perhaps arose directly from the flagellates. Bryophytes and later the vascular plants (those with a conducting system) may have evolved directly from green algae. Hornworts, although without roots or true leaves developed conductive tissues. True vascular tissues appear among early Psilotum-like plants. Over millions of years these species adapted to land, giving rise to more complex non-flowering species, the ferns and their allies, and gymnosperms. Finally to flowering plants.
| Taxonomic Hierarchy | |
|
Land Plants with conductive and supporting tissues (vascular) first appeared around 400 million years ago. These samples represent some of the known fossils of non-flowering species occasionally discovered in coal.  Ginkgo |
|
 Horsetail |
|
| Kingdom | Plantae – Vegetal, plants |
| Subkingdom | Viridaeplantae – green plants |
| Infrakingdom | Streptophyta – land plants |
| Division | Tracheophyta – vascular plants, tracheophytes |
| Direct Children: | |
| Subdivision | Pteridophytina – pteridophytes |
| Subdivision | Spermatophytina – spermatophytes, seed plants |
 Lycopod |
|
 Seed Fern |
|
| Tracheophyta, Taxonomic Serial No.: 846496 | |
No comments:
Post a Comment