Mycophycobiosis
A mycophycobiosis (composed of myco-, from the Ancient Greek: μύκης (mukês, "mushroom"), phyco-, from Ancient Greek: φῦκος, (phûkos, fucus, used for algae), and -biose, from ancient Greek: βιόω (bióô, "to spend one's life") is a symbiotic organism made up of a multicellular alga and an ascomycete fungus housed inside the alga (in the thallus for example). The alga and fungus involved in this association are called mycophycobionts.