Why did giant lycophyte trees disappear after the Carboniferous Period?

The giant lycophyte trees, such as Lepidodendron and Sigillaria, did not simply disappear due to an inherent biological failure; rather, their extinction was tied to the loss of their specialized habitat. These arborescent lycopsids thrived in the extensive, humid peat-forming swamps that characterized the equatorial regions during the Early and Middle Pennsylvanian epochs of the Carboniferous Period.1

As the Carboniferous Period drew to a close, significant environmental and geological shifts occurred. The development of mountains and changing sea levels altered the landscape, leading to the disappearance of these vast, stable swamp environments. Because these giant lycophytes were ecologically dependent on these specific wetland conditions, they could not survive the transition to the drier, more varied climates that followed. Consequently, the extinction of these trees was a direct result of the disappearance of the coal swamps they required to complete their life cycles.21