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thumb|right|Stages in the liberation of the peridiolum by Sphaerobolus stellatus Sphaerobolus is a genus of fungi in the family Geastraceae. Commonly known as the "cannonball fungi", species discharge their spores with explosive force. Discharged spore sacs are sticky and have a tendency to strongly adhere to whatever surface they encounter, making them a nuisance to homeowners, pressure washing contractors, landscape mulch producers and insurance companies.