in Morphology of Flowering Plants by

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Stamens or microsporophyll consists of slender stalk, the filament and the anther. The anther lobes are connected by a sterile tissue known as connective. The anther lobe has the microsporangia which contains numerous microspores or pollen grains. Each anther lobes has two pollen sac or microsporangia; so an anther has four microsporangia. Whereas staminodes are sterile stamens which not at all produces fertile anthers.