 The fruit body remains closed until shortly before spore discharge ; dehiscence ( fruit body opening ) is caused by the pressure exerted by swollen paraphyses — sterile ( i.e. , non @-@ reproductive ) cells that are interspersed between the ascospores . <unk> is accompanied by the release of clouds of spores , resembling smoke . The spore puffing upon rupture is thought to be caused by the sudden change in relative humidity between the interior chamber of the fruit body and the outside environment . <unk> is accompanied by a hissing sound , an auditory phenomenon known to occur in about fifteen other fungal species . 
