Explain the process of spore dispersal in the Polytrichum?
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In the mature capsule all the cells except the spore begins to disintegrate forming a hollow cavity. The calyptra gets thrown off exposing the upper part of the capsule. So that it dry causing the shrinkage of cells,  so that the thin walled cell between the Peristome and the margin of epiphragm dry up so it creates small opening. The spores are dispersed through this small opening by the censor mechanism.