psilopsids

Psilopsids are an extinct group of early vascular plants that lived during the Devonian period. They represent some of the earliest known land plants and are considered a basal lineage within the tracheophytes, the group that includes all vascular plants. Fossil evidence suggests psilopsids were relatively simple in structure, typically possessing dichotomously branched stems and lacking true leaves and roots. Instead, they often had rhizoids for anchorage and nutrient absorption.

Reproduction in psilopsids likely occurred via spores, which were produced in specialized structures called sporangia, often located at the tips of the branches. The vascular tissue, responsible for transporting water and nutrients, was present but likely less complex than in later plant groups. Psilopsids are significant for understanding the evolutionary transition of plants from aquatic to terrestrial environments. Their fossil record provides crucial insights into the development of key plant adaptations such as vascularization and upright growth. Prominent examples include genera like Rhynia and Psilophyton.