The leaf blade is the broad, usually flattened portion of a leaf that forms most of its visible surface. It is also called the lamina and is the main part of the leaf responsible for intercepting light, carrying out photosynthesis, and supporting gas exchange and transpiration.
Leaf blades vary widely in shape, thickness, texture, margin, and venation. They may be simple or divided and are usually attached to the stem by a petiole, although some leaves are sessile and attach directly to the stem.
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