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peridium
The peridium is the protective layer that encloses a mass of spores in fungi.〔''British Fungus – Flora'', by George Massee; page 6; Published by George Bell and Sons, 1892 〕 This outer covering is a distinctive feature of gasteroid fungi.
==Description==
Depending on the species, the peridium may vary from being paper-thin to thick and rubbery or even hard. Typically, peridia consist of one to three layers. If there is only a single layer, it is called a peridium. If two layers are present, the outer layer is called the exoperidium and the inner layer the endoperidium. If three layers are present, they are the exoperidium, the mesoperidium and the endoperidium.
In the simplest subterranean forms, the peridium remains closed until the spores are mature, and even then shows no special arrangement for dehiscence or opening, but has to decay before the spores are liberated.〔"Fungi Mycetozoa and Bacteria". Eng. Ed. "A Monograph of the British Gastromycetes", ''Annals of Botany'', vol. iv. 1889.〕
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