Why were lycophytes prominent in Carboniferous swamp forests?

Lycophytes were prominent in Carboniferous swamp forests primarily due to their evolutionary adaptations that allowed them to thrive in wetland environments. During the Carboniferous Period, these plants developed the ability to produce secondary growth, which enabled them to overcome previous size restrictions and grow into massive, tree-sized forms such as Lepidodendron and Sigillaria.123

Their dominance was further supported by the evolution of a heterosporous life cycle. By producing two sizes of spores, these plants achieved more rapid reproduction and reduced mortality compared to homosporous species, making them highly successful in the widespread wetland habitats of the time. Because these plants required an abundant source of water for fertilization, they were ideally suited to the extensive peat-forming swamps that characterized the era. Their remains eventually formed the majority of the world's great coal beds.24