Definition of heterospory in US English:

heterospory

noun

  • See heterosporous

    • ‘Since the ‘seed habit’ begins with the reduction to a single functional megaspore in each megasporangium, heterospory seems like a logical intermediate step.’
    • ‘According to this argument, heterospory was the intermediate between homosporous free-sporing reproduction and the retained endosporic gametophyte of the seed habit.’
    • ‘The Order Isoetales and Lepidodendrales are sometimes included in the Subclass Ligulatae - defined by the presence of ligules, heterospory, and endospory.’
    • ‘W.A. DiMichele has argued that free-sporing heterospory will only be favored in swamp environments, where gametes can move easily between unisexual gametophytes.’