Mycena galericulata, commonly known as the Common Bonnet, is a small saprotrophic mushroom that grows on decaying wood, especially in forests and woodlands. This small to medium-sized fungus has a bell-shaped or conical cap, which ranges from light grey to brown, with a smooth and often moist surface. The cap, measuring just 2–4 cm in diameter, eventually flattens as it matures. The gills underneath are white to pale grey and are free from attachment to the stem, which is slender, fragile, and slightly translucent. In mature specimens, “veins” cross connect the gills. The stem can grow up to 10 cm long and is often hollow. M. galericulata typically fruits in large clusters on decaying logs, stumps, and fallen branches, particularly of deciduous trees. It is widespread in temperate regions and appears from spring to autumn. Though it is not considered edible due to its small size and unremarkable taste, M. galericulata plays a vital ecological role by breaking down lignin and cellulose in wood, contributing to nutrient recycling in forests.