heterospory

noun

het·​ero·​spo·​ry ˈhe-tə-rə-ˌspȯr-ē 

ˌhe-tə-ˈrä-spə-rē

: the production of microspores and megaspores (as in seed plants)

heterosporous

ˌhe-tə-rə-ˈspȯr-əs  -ˈrä-spə-rəs 

adjective

Word History

First Known Use

1898, in the meaning defined above