Rare but attested verb meaning 'to become covered with fungus' or 'to cover with fungus'.
Definitions
(intransitive) To become covered with fungus; to develop fungal growth. If the wallpaper stays damp, it will fungus within a week.
(transitive) To cause to become covered with or affected by fungus. Neglected wooden planks were soon fungused by moisture.
Attributive use of the noun before another noun, e.g., 'fungus gnat'.
Definitions
Attributive; relating to or associated with fungus. The seedlings were infested with fungus gnats.