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A peridiole is a small, lenticular body found within the peridium (outer wall) of certain fungi, specifically those in the family Nidulariaceae, also known as bird's nest fungi. These peridioles contain the fungal spores. The fruiting body of these fungi resembles a nest, and the peridioles are often described as the "eggs" within the nest. When mature, these peridioles disperse, carrying the spores with them. This is a part of the reproductive process in these fungi, which are part of the larger kingdom Fungi.123

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