mesospore
noun
meso·spore
"+ˌ-
variants
or less commonly mesosporium
¦⸗⸗¦spōrēəm
plural mesospores
-z
or mesosporia
-ōrēə
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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Merriam-Webster unabridged
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