Leucocoprinus birnbaumii is a small, yellow mushroom commonly known as the Flowerpot parasol or Plant pot dapperling. It is a saprobic fungus that often appears in greenhouses and flowerpots, especially with woody plants. It has a distinct yellow cap, thin stem, and gills underneath the cap.

Cap starts off oval to egg-shaped when young and later develops into a broadly conical, broadly convex, or bell-shaped form. It has a dry texture and is covered in a powdery to finely scaly surface. As it matures, the cap's margin becomes lined or grooved, almost reaching the centre. The colour ranges from bright to pale yellow, often with a darker centre. Gills light yellow to white, thin, free from the stem, crowded and covered by a partial veil when young. Stem narrowly bulbous or swollen at base, tapering to a very narrow apex, hollow. The surface is white and smooth. The ring is well developed but thin and easily detached. Spore print white.

Microscopic Features: The spores are ellipsoidal in shape, smooth, and have thick walls. They measure approximately 8-12 x 5-9μm in size. Additionally, they exhibit dextrinoid characteristics.

Leucocoprinus birnbaumii on the First Nature Web site.
Leucocoprinus birnbaumii on the MushroomExpert.Com Web site.

The third photo is by Ryan Van Gelder and licensed under the Creative Commons Attribution 3.0 Unported license.