Sorus

Sorus (plural sori) is a cluster of sporangia (structures producing and containing spores) in ferns and fungi. This term is derived from the Greek word σωρός (sōrós), meaning "heap" or "pile".

Morphology

In ferns, sori are usually born on the underside of the frond, but they can also appear along the margin or on the top side. They are often protected by a scale or a cover called an indusium, which can be a part of the frond itself or a separate structure.

In fungi, the term "sorus" is used to refer to a cluster of spore-producing structures called basidia or asci.

Function

The primary function of a sorus is to produce and store spores, which are a key part of the reproductive process in ferns and fungi. When the spores are mature, they are released into the environment where they can germinate and grow into a new organism.

Types of Sori

There are several types of sori, including:

• Acrostichoid sori: These sori cover the entire underside of the frond.
• Costal sori: These sori are found along the midrib of the frond.
• Marginal sori: These sori are found along the edge of the frond.
• Peltate sori: These sori are shield-shaped and have an indusium.

See also

• Sporangium
• Spore
• Fern
• Fungi

References

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