Plural of 'ensporium'; a specialized fungal structure that contains spores (often used in mycology).
From Latin 'en-' (in) plus 'sporium' (spore container), itself from 'spora' (seed/spore) from Greek 'sporos.' The term is technical botanical/mycological terminology.
This is specialized scientific vocabulary that linguists love because 'ensporia' is plural of a Latin-style singular that barely gets used—it's a word for microscopic fungal structures that most people will never encounter outside of mycology classes.
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