One of the mysteries of the English language finally explained.
The outer skin of a sporangium or other fruiting body of a fungus.
- ‘Numerous golden sporangia with persistent peridia still intact formed on the bark surface and on mosses.’
- ‘This is an example of a peridium, a rather vague term that includes any shell or membrane that encloses spores - for example, the visible outer membrane of a puffball.’
Early 19th century: from Greek pēridion, literally ‘small wallet’, diminutive of pēra.
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