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(A) Immature fruiting body of Sphaerobolus. (B) The developed fruiting body with the exposed gleba (Ø1 mm, contains the spores) that is supported by an elastic membrane within a firm outer case of the cup. (C–D) When a critical pressure is reached inside the cells of the elastic membrane, the membrane everts rapidly, discharging the gleba from the cup. Scale bar 1 mm.
