What does peridium mean?
A peridium is the outer wall of a sporangium, a structure in which fungi produce and contain spores. In mycology, the term refers especially to the protective covering around a spore-bearing capsule, although it can also be described more generally as the external layer of a sporangium. The peridium may rupture, split, or develop pores as the spores mature, allowing them to disperse. Its thickness, texture, color, and pattern can help distinguish one fungal group or specimen from another. The word belongs primarily to botanical and mycological description rather than everyday language. Its plural is peridia. Peridium is also related etymologically to words such as periphery and perimeter, all reflecting the idea of something surrounding or extending around something else.
nounThe outer wall or covering of a sporangium, especially the spore-bearing body of a fungus. In mycology, it forms the protective layer surrounding the spores within a sporangium.
- The outer wall or covering of a sporangium, especially in fungi.
"The peridium is gradually ruptured as the mature sporangium releases its spores."
"Mature spores escape through an opening that develops in the peridium."
"The color and thickness of the peridium are useful features for identifying the fungal specimen."
The standard plural is peridia, though the plural peridiums is also encountered in less technical usage.
"Thin peridia surround the developing spore masses."
A peridium is a fungal spore capsule’s protective outer wall—the botanical equivalent of a fortress around its cargo of spores.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does peridium come from?
The English word comes through New Latin from Ancient Greek perídion, a diminutive associated with the Greek prefix peri-, meaning “around.” The name aptly describes a protective outer layer surrounding a sporangium. Its wider relatives include periphery, peripheral, perimeter, and periscope, which preserve related ideas of surrounding something or looking around it.
Related word forms
How peridium is actually used
This is chiefly a specialist botanical and mycological term used in formal or technical writing. It is not a general synonym for every external covering.