Mycorrhaphium citrinum is a species of tooth fungus in the family Steccherinaceae that is found in Africa.
The type collection was made in Chati, a region in the Copperbelt Province in Zambia, where it was found growing in leaf litter.
The fruit body of the fungus has a circular to fan-shaped of semicircular cap measuring 1.5 cm (0.6 in) in diameter.
The underside of the cap features pale yellow, densely crowded spines measuring 1–3 millimetre long.
Like other Mycorrhaphium species, the dimitic portion of the hyphal system of M. citrinum is confined to the spines; the remainder of the context is monomitic.