heteroecy
/hɛtərəʊˈsɪ/Definitions
1. noun
A type of alternation of generations in plants, where the sporophytes and gametophytes have distinct and often very different forms, often with a different environment or habitat.
“The ferns exhibit a phenomenon known as heteroecy, with the spore-producing sporophytes growing on trees and the gametophytes living on the forest floor.”