A plural form referring to multiple cleistothecia, which are closed spore cases found in fungi.
From cleisto- (closed) + theca (case, container), with -ia being a Latin plural ending. Used in mycology to describe the closed fruiting structures of certain fungi, particularly ascomycetes.
Fungi got in on the 'closed' reproduction strategy too—cleistothecia are basically sealed spore packages that fungi create to protect their reproductive material, ensuring dispersal even in harsh conditions.
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