Stamen- With pollen inside pollen sacs

I recently came across a flower, with pink petals, and a conical strcuture as the central whorl full of small and minute stamen. I couldnt pluck the flower, but using the forceps, I took out a bunch of stamen. I observed distinctly the filament, and also while observing the anther, I saw certain portions with spherical pollen grain still inside the pollen sac. It was insightful to look at the structures and learn in greater depth.

The stamen observed under the hand lens.
Filament near its junction with the anther.

Pollen as observed inside the anther

I had some wuestions, like in the picture of the single pollen grain, is the smaller darker structure the nucleus, or the generative cell within the vegetative cell.

Manan

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