One of the mysteries of the English language finally explained.
In early use: †a structure enclosing a group of spores, especially in an alga; a sporangium (obsolete). Later: the outermost layer of the spore wall, or layer outside the spore wall, especially in ferns and mosses.
Mid 19th century (in an earlier sense). From peri- + spore, after French périspore.
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