Composition No 1916 - Frond

Fronds, like all leaves, usually have a stalk called the petiole supporting a flattened blade, sometimes called a lamina. However, fronds are often described using distinctively different terms. The petiole of a frond is called a stipe and the continuation of the stipe into the blade portion is called the rachis. The blades may be simple (undivided), pinnatifid (deeply incised, but not truly compound), pinnate (compound with the leaflets arranged along a rachis to resemble a feather). If a frond is pinnate, the segments of the blade are called pinnae (singular: pinna) and the stalks bearing the pinnae are called petiolules (The main vein or mid-rib of a pinna is sometimes called a costa)
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