Calocybe gambosa, commonly known as St. George's mushroom, is an edible, medium to large, fleshy, cream mushroom which typically grows in rings or troops on soil. It is most commonly found in pastures but also less frequently appearing in mixed woods.

Cap white-creamy coloured to bright yellow, often with brownish tinge. At first sub-spherical, becoming expanded and irregularly convex with an incurved margin. Gills sinuate, white and crowded. The flesh is thick and soft and has a mealy or cucumber smell. The spore print is white to pinkish white. Stem whitish, smooth, bulky at the base. The mushroom has no ring.

Similar species Spring fruiting white Entoloma species are distinguished by pink spore deposits and pink mature gills.

Calocybe gambosa on the www.first-nature.com web site.