an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia
"The gardener carefully removed the white fungus growing on the rotting log, knowing it feeds entirely on the decaying wood."
Any member of the kingdom Fungi; a eukaryotic organism typically having chitin cell walls but no chlorophyll or plastids. Fungi may be unicellular or multicellular.
"The damp basement quickly became overrun by black mold, which is actually just a type of fungus growing on the drywall."