Lepidodendron is the name (= form-genus) for impressions of the outer bark of large arborescent lycophytes. Lepidodendron is also the name that paleobotanists use to refer to the biological genus for entire plant, including all of its individual parts. Lepidodendron grew to over 100 feet (30 meters) tall and preferred the wetter, but not wettest areas in swamps.
Lepidodendron is recognized by the diamond-shaped pattern of leaf scars that spiral around the trunk of the tree; each scar being generally taller than wide.
During the life of the tree, the outer bark of Lepidodendron trees would be shed revealing the layer beneath. This inner bark layer displayed a different pattern and is given a separate and distinct name, called Knorria, when found in the fossil record.