Lepidodendrales

The Lepidodendrales were an order of extinct, tree-sized plants that lived during the Carboniferous Period, approximately 359 to 299 million years ago. These plants, related to modern club mosses, could reach heights of up to 40 meters (130 feet) and diameters of 2 meters (7 feet).1

Key characteristics of Lepidodendrales include:
* Trunk Structure: They possessed a slender central wood strand and thick bark. Their underground parts, known as Stigmaria, are not considered true roots.1
* Leaf Arrangement: Young plants had unbranched trunks with long leaves near the tip. As they matured and branched, older leaves were shed, leaving behind distinctive diamond-shaped leaf bases on the stem.1
* Reproduction: They reproduced via spores, with some genera producing spore-bearing cones at branch tips.1

These plants were a dominant feature of the extensive peat-forming swamps of the Early and Middle Pennsylvanian epochs and became extinct when these swamp environments disappeared. The order is characterized by dichotomous branching and conspicuous, spirally arranged leaf scars on the trunk.123