epispore

noun
ep·i·spore | \ -ˌspō(ə)r \

Definition of epispore 

1a : the covering or outer membrane of a spore (such as the membrane surrounding the megaspore in heterosporous ferns)

b : exospore sense 2

2 : the outer layer of a sporocyst

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History and Etymology for epispore

epi- + -spore

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