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In a willow, microspores are not liberated from the anther (themicrosporangium), but develop into pollen grains (microgametophytes) within it.
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In parallel to these developments, the other kind of sporangium, themicrosporangium, produces microspores.
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Male spores (microspores) are extremely small and are produced inside eachmicrosporangium.
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A pollen grain develops from a microspore in themicrosporangiumand contains the male gametophyte.
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Microspores develop within themicrosporangiumby meiosis.
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