What is "pollen sac"

Pollen \Pol"len\, n. [L. pollen fine flour, fine dust; cf. Gr. ?]

1. Fine bran or flour. [Obs.]
   --Bailey.

2. (Bot.) The fecundating dustlike cells of the anthers of flowers. See Flower, and Illust. of Filament.

   Pollen grain (Bot.), a particle or call of pollen.

   Pollen mass, a pollinium.
   --Gray.

   Pollen sac, a compartment of an anther containing pollen, -- usually there are four in each anther.

   Pollen tube, a slender tube which issues from the pollen grain on its contact with the stigma, which it penetrates, thus conveying, it is supposed, the fecundating matter of the grain to the ovule.

Pollen sac may refer to:

• Structures in plants that hold pollen
• Bee pollen, sacs or balls of pollen packed by bees