What is the function of the sori?
Sori are clusters of sporangia found only in ferns (singular: sorus). These are a product of sexual reproduction. The sporangia within the clusters each house several haploid spores. After release from the sporangium, these spores will generate and grow into the gametophytic generation under proper conditions.
What is sori and how does it help a plant?
sori) is a cluster of sporangia (structures producing and containing spores) in ferns and fungi. In some species, they are protected during development by a scale or film of tissue called the indusium, which forms an umbrella-like cover.
What are frond and sori?
The reproductive structures on the underside of the frond. Each sporangium is a capsule that contains spores. They are usually aggregated into clusters called sori. Fronds that have sporangia on their underside are fertile, and those that don’t are sterile.
What is sorus tissue?
Sorus tissue is the “pregnant” area at the center of the kelp blade containing the sporangia, which are cells that generate and contain the spores.
Where sori are present on the leaves?
Sori (singular: sorus) are groups of sporangia (singular: sporangium), which contain spores. Sori are usually found on the underside of the blade. Young sori are commonly covered by flaps of protective tissue called indusia (singular: indusium).
What cell is produced in the sori?
Sori occur on the sporophyte generation, the sporangia within producing haploid meiospores. As the sporangia mature, the indusium shrivels so that spore release is unimpeded.
Why sori is surrounded by thick coat?
In some red algae, it may take the form of a depression into the thallus. In ferns, these form a yellowish or brownish mass on the edge or underside of a fertile frond. Explanation: Thus, sori are surrounded by a thick coat.
What are called sori?
sorus, plural sori, in botany, brownish or yellowish cluster of spore-producing structures (sporangia) usually located on the lower surface of fern leaves. Reproductive structures called sori also occur in various species of marine algae. See also spore.
What are the dots on the back of fern leaves?
These neat clusters of dots on the backs of fern foliage are spores, and it is the method by which ferns reproduce. So these dots are a good thing – they tell you that your fern is happy, and virile!
Are sori diploid?
The veins of the fronds are vascular bundles, hence ferns are classified in the vascular plants. The fronds are part of the sporophyte, each cell, therefore, is diploid (2n). The little dots on the underside of fern fronds are collections of sporangia—the collections are known as sori (sorus is the singular).
What is indusium botany?
A flap of tissue that partially or completely covers each sorus in certain ferns. It is an outgrowth of the placenta. Indusia are seen on the undersur-face of the fronds of Dryopteris as lines of brown kidney-shaped outgrowths.