Question

Define frond, stipe, pinna, pinnule.

   Define frond, stipe, pinna, pinnule.

Plant Systematics

Plant Systematics

Michael G. Simpson 2nd Edition

Chapter 4, Problem 71

Instant Answer

Solved by Expert Parvati Devi

02/04/2022

Step 1

It is usually divided into smaller segments called pinnae. Stipe: The stipe is the main stalk or stem of a frond or leaf. It provides support and connects the frond to the plant's main stem or root. Show more…

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Key Concepts

Frond

The frond refers to the large leaf-like structure of a fern. It is typically divided into segments and can vary widely in shape and size. In botanical terms, the frond is the primary photosynthetic organ and is often used as a key identifying feature in ferns and other related plants.

Stipe

The stipe is the stalk that supports the frond, functioning similarly to a petiole in other plant types. It connects the frond to the main body of the plant and can vary in texture and thickness, often providing structural support and aiding in the positioning of the frond for optimal light capture.

Pinna

The pinna is one of the primary divisions or segments of a fern frond. In ferns with compound leaves, the frond is divided into multiple pinnae, which are arranged along the stipe. Each pinna contributes to the overall structure and appearance of the frond, and its shape and arrangement are important for identifying different fern species.

Pinnule

The pinnule is a smaller subdivision of a pinna, representing the final or near-final segment of division in a compound leaf. Pinnules are essentially the secondary or tertiary subdivisions, further increasing the complexity and often the overall surface area of the frond for enhanced photosynthetic efficiency.

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