How did Lepidodendron differ from Sigillaria?

Lepidodendron and Sigillaria were both tree-sized, extinct lycopsids from the Carboniferous Period, but they differed primarily in their ecological preferences and growth habits.12

• Ecological Niche: Lepidodendron was adapted to the extensive peat-forming swamps of the Carboniferous. In contrast, Sigillaria appears to have preferred the mineral soils of river floodplains. This preference for better-drained environments may have enabled Sigillaria to persist longer than Lepidodendron during the drying of coal swamps in the middle of the Pennsylvanian Subperiod.31
• Growth and Branching: Lepidodendron typically grew as a tall, branched tree, often reaching up to 40 meters in height, with branching occurring at the growing tip or through lateral branches. Sigillaria was characterized by a single or only sparsely branched trunk.31
• Leaf Scars: While both genera shed leaves as they grew, leaving behind distinct patterns on their bark, the specific arrangement and shape of these leaf bases are key features used to distinguish between the various genera of arborescent lycopsids.13