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Handkea utriformis, synonymous with Lycoperdon utriforme or Calvatia utriformis, is a species of the puffball family Lycoperdaceae. A rather large mushroom, it may reach dimensions of up to 25 centimetres (9.8 in) broad by 20 centimetres (7.9 in) tall. It is commonly known as the mosaic puffball, a reference to the polygonal-shaped segments the outer surface of the fruiting body develops as it matures. Widespread in northern temperate zones, it is found frequently on pastures and sandy heaths, and is edible when young. H. utriformis has antibiotic activity against a number of bacteria, and can bioaccumulate the trace metals copper and zinc to relatively high concentrations.