An alternate term for the outer layer or coating of a spore; the exosporium or protective envelope surrounding the spore itself.
From Greek epi- 'upon' + spora 'spore' + -ium (Latin neuter noun suffix). Variant of epispore used in certain mycological contexts.
The episporium of spores is made of lipids and proteins that are so resistant that spores can survive in space, buried for centuries, or blasted by radiation—some of nature's toughest construction!
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