A sorus (pl.: sori) is a cluster of sporangia (structures producing and containing spores) in ferns and fungi. A coenosorus (pl.: coenosori) is a compound sorus composed of multiple, fused sori. This Neo-Latin word is from Ancient Greek σωρός (sōrós 'stack, pile, heap'). In lichens and other fungi, the sorus is surrounded by an external layer.

3 days ago · Fern - Spore, Sorus, Reproduction: Sori are complex aggregations of sporangia. The indusium protects the sporangial cluster. About one-third of fern species have paraphyses. The chromosome base numbers range from approximately 20 to 70. Ferns overall have relatively high levels of polyploidy, but these are all of relatively recent origin.

Sorus, in botany, brownish or yellowish cluster of spore-producing structures (sporangia) usually located on the lower surface of fern leaves. A sorus may be protected during development by a scale or flap of tissue called an indusium.

Sori (singular: sorus) are groups of sporangia (singular: sporangium), which contain spores. Sori are usually found on the underside of the blade.

Fern sporophytes are composed of megaphylls, often pinnately compound fronds that emerging as fiddleheads in the spring. Sporangia are produced in clusters called sori (sorus, singular) on the fronds.

Dec 3, 2024 · In ferns, sporangia appear in clusters called sori, located on the undersides of some fronds or in bead-like aggregates, sometimes on separate fertile fronds. A sorus may be protected during development by a scale or flap of tissue called an indusium. In rust and smut fungi, a sorus is a spore mass produced on the leaf of an infected plant.

Aug 19, 2022 · Fern sporophytes are composed of megaphylls, often pinnately compound fronds that emerging as coiled fiddleheads in the spring. Sporangia are produced in clusters called sori (sorus, singular) on the fronds (Figure \(\PageIndex{11}\)).

Observe a mature fern frond. Locate the rachis, pinnae, and sori. Label the bolded structures in the life cycle diagram. Obtain a prepared slide of a sorus. A sorus is a cluster of sporangia, often protected by an umbrella-like structure called the indusium as the spores mature.

Fern sorus is easily identified by its brownish-yellow colour. In house ferns, when sori develop on the leaves and are in a young stage, are mistaken for tiny insects and for a fungus disease when they develop further.

False Indusium – no separate outgrowth of leaf to form an indusium. Rather, the edge of the leaf curls over the sorus, providing the same function as a true indusium. Peltate – umbrella-shaped. Indusium grows out of the middle of the sorus. Reniform – kidney-shaped. Indusium grows out of leaf right next to sorus to cover it.