a type of leaf found in ferns and seed plants, with a large complex vascular system
A leaf with several or many large veins branching apart or running parallel and connected by a network of smaller veins. The fronds of ferns and the leaves of gymnosperms and angiosperms are megaphylls. Megaphylls are thought to have evolved from groups of branched stems that have become fused together. Also called macrophyll. Compare microphyll.