Hierarchy classification:

1. top of the aat hierarchies
2. Agents Facet
3. Living Organisms (hierarchy name)
4. living organisms (entities)
5. Eukaryota (domain)
6. Plantae (kingdom)

Anotations

Scope note:

Small plant distinguished by the club-like shape of its upright fertile spore-cases and the very small microphylls, a kind of leaf that arose and evolved independently from the leaves of other vascular plants; the microphyll has only a single unbranched strand of vascular tissue. While this division is a small and inconspicuous group of plants today, in the Carboniferous some lycophytes were forest-forming trees more than 35 meters tall. Lycophytes are the oldest extant group of vascular plants, and dominated major habitats for 40 million years.