Mycena flavoalba, commonly known as the ivory bonnet, is a species of inedible mushroom in the family Mycenaceae. The cap is initially conical in shape, before becoming convex and then flattening out; it may reach dimensions of up to 1.5 cm (0.6 in) across. The cap color is ivory-white to yellowish white, sometimes more yellowish at the center. The tubular stems are up to 8 cm (3.1 in) long and 2.5 mm (0.10 in) thick, and have long, coarse white hairs at their bases. The mushroom is found in Europe, the Middle East, and North America, where it grows scattered or in dense groups under conifers and on humus in oak woods.