Pleurotus citrinopileatus, also known as the Golden oyster mushroom, is a small to medium-sized agaric native to eastern Russia, northern China, and Japan. It can also be found in certain regions of North America and is considered comparable to an invasive species there. In Japanese, the mushroom is named Tamogitake. The mushroom's unusually bright colouring and refined conical shape of the fruit bodies attract attention. The mushroom grows in clusters on the deadwood of hardwoods, especially elms in summer and fall.

Cap bright yellow to golden brown coloured with a velvety, dry surface texture. It is first convex with an incurved margin, expanding to a fan-shaped flat or shallowly depressed disc. Gills whitish, decurrent (running down the stem), distant or nearly so with frequent short-gills. Stem central or slightly off-centre, cylindrical, white in colour, often curved or bent. It is fused with other stems at the base, in a whitish mass of tissue. Spore print pale lilac.

Microscopic Features: Spores are 7–10 x 3–4 µm in size, elongated-ellipsoid to subamygdaliform in shape, smooth, transparent in KOH, and inamyloid.

Pleurotus citrinopileatus on the MushroomExpert.Com web site.