Early vascular plant — Psilophyton crenulatum

Geologic period: Early Devonian — Emsian

Age: Early Devonian, including earliest Emsian material.

Feeding: Photosynthetic plant.

Body plan: Leafless branching axes with vascular tissue, surface emergences and terminal reproductive structures.

Evidence: Branching stems, vascular anatomy and emergences are direct fossil evidence. Recent research proposes that some emergences may have functioned as rooting structures.

Why it matters: Psilophyton records an important stage in the evolution of complex vascular land plants.

Plain Language Identity: An Early Devonian vascular plant belonging near the base of the euphyllophyte lineage that later produced ferns, horsetails and seed plants.

What You Are Looking At: Branching vascular plant axes bearing numerous small surface emergences and reproductive structures.

Ecosystem: Early terrestrial ecosystem before forests of large trees became widespread.

Preservation: Compression and anatomically preserved plant material.

Open Questions: The rooting interpretation of the emergences is a scientific hypothesis supported by anatomy and distribution, not a directly observed behavior.

Source Urls: https://naturalhistory.si.edu/visit/virtual-tour/current-exhibits/deep-time-virtual-tour-fossil-list; https://academic.oup.com/aob/article/137/6/1689/8161335; https://pubmed.ncbi.nlm.nih.gov/40509904/

Enrichment Method: SAGE curated research pass; title and scientific name matched; evidence separated from inference

Scientific name: Psilophyton crenulatum

Evidence / representation: comparative_exact_taxon_visual

comparative_exact_taxon_visual

Life Conquers the Land: Forests, Fishes and the First Four-Legged Worlds.

Media license: CC BY-SA 4.0

https://creativecommons.org/licenses/by-sa/4.0