(a) The leaves are large and are called fronds in ferns.
(b) Some ferns have simple leaves with one blade.
(c) But most ferns have pinnately compound leaves i.e., blades are divided into leaflets or pinnae like feather.
(d) The pinnately compound leaves may be unipinmte (leaflets not divided), bipinnate (leaflets subdivided once), tripinmte (leaflets divided twice).
(e) Ferns are regarded as ornamental plants because of their graceful compounds leaves.