The vegetative body of acellular slime mould consists of a naked mass of multinucleate protoplasm covered with slime. This body shape resembles amoeba. As the amoeba-like stages grow they undergo nuclear division, which can lead eventually to very large multinucleate masses of naked (wall-less) protoplasm.
During reproduction, depending on environmental conditions, these multinucleate masses can develop into large resting structures (sclerotia) or they can differentiate into spore-bearing (fruiting) structures. The life cycle is completed when the spores are dispersed, usually by wind, and then germinate to release amoeboid cells.
This implies that the naked fungi (slime moulds) are naked only when they are not reproducing.
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