Sori are located on the underside of the fern, what is their meaning.

Ferns are among the highest spore plants. On the reverse side of the leaf (fronds) are sporangia – these are formations in which spores develop and mature. The collection of sporangia is called sori, which have the appearance of brownish tubercles. They are located in a certain sequence and in some species, the maturation of spores in them occurs gradually, in order to adapt to unfavorable conditions.

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