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La uspore realise une mitose qui donne :C vegetative + C reproductrice -> c'est a ce stade biCQu'apparait grain de pollen (gametophyte male, n) Degenerescence du tapis -> paroi se degrade et le contenu C se retrouve dans le sac pollinique Pollen binuclée d'ajonc, assise mecanique fonctionnelle -> libération des grains de p via zones de dehiscences de l'anthere
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