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mesospore

noun
meso·​spore | \"+ˌ-\
variants: or less commonly mesosporium \ ¦⸗⸗¦spōrēəm \
plural mesospores\ -​z \ or mesosporia\ -​ōrēə \

Definition of mesospore 

1 : the middle coat of a spore that has three coats

2 : a one-celled spore found among the compound teliospores of some rusts (as members of the genus Puccinia)

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History and Etymology for mesospore

mesospore from mes- + -spore; mesosporium from New Latin, from mes- + -sporium

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