A common woodland mushroom that grows in dense clusters on decaying stumps, logs, and buried wood. Its caps are bright yellow to greenish-yellow, often darker toward the center, and the gills shift from yellow to olive-green as they mature. The slender stems share the same sulfur-yellow tone. This species is bitter-tasting and poisonous, causing stomach upset if consumed. Its clustered growth and vivid coloring make it a striking but inedible feature of the forest floor.

Scientific name: Hypholoma fasciculare

Fruiting season: Fall and winter, sometimes spring.