Lichenomphalia umbellifera, commonly known as the Lichen Agaric, is a small mushroom distinguished by its pale, umbrella-shaped cap and slender stem, which arise from a greenish, granular thallus formed in symbiosis with algae. It typically occurs on soil, moss, or decaying organic matter in heathlands, moorlands, woodland clearings, and other nutrient-poor habitats, often forming scattered groups or small clusters. This species can be found from spring through autumn and is widespread in temperate regions.

Cap small, planoconvex to shallowly convex, sometimes with a wavy margin. Surface lubricous, bald, and dull yellowish to brownish, often lined at the margin. Flesh thin, whitish, and unchanging when cut. Gills distant, thick, and waxy, running down the stem. Whitish to pale yellowish in colour, with short gills present near the margin. Stem slender, equal in width, moist, and bald or nearly so, with a fuzzy base. Pale brownish to pale yellowish in colour. Spore print white.

Microscopic Features: Spores measuring 7–10 × 5–7 µm, ellipsoid to broadly tear-shaped, smooth, and hyaline in KOH.

Lichenomphalia umbellifera on the MushroomExpert.Com Web site.