spores are light & small & encapsulated
The spores are very resistant to the the external environment since they are encapsulated structures , this type of dispersal helps past against natural calamities and promotes more living of the plant in further generations in extreme conditions . Since they are light weight and have small size they can be dispersed easily so helps in diversification of the plant in the area . These advantages are not well suited for sperms. Moreover, in mosses, the sperm requires water for the movement to meet the ova cells to make zygote.
jean keeling
The spores, as opposed to sperm, the primary means of dispersal in moss are bryophyte spores are very small and easily wind-dispersed, potentially over fairly long distances.
Moss spores are small single celled packages that play a crucial role in establishing new populations.
Thus, these are primary source of dispersion.
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