Each pollen cone has numerous spirally inserted microsporophylls each with two basal pollen sacs producing bisaccate pollen.
12.
An anther consists of four pollen sacs, two on each side, with a small sterile central connective.
13.
There are between 6 and 16 microsporophylls present with each containing with 3 or 4 pollen sacs.
14.
A pollen cone consists of many spirally arranged microsporophylls each with two pollen sacs producing bisaccate pollen.
15.
In gymnosperms, such as conifers, microspores are produced through meiosis from microsporocytes in pollen sacs, which contain the microsporocytes.
16.
The fertile sporogenous cells are surrounded by layers of sterile cells that grow into the wall of the pollen sac.
17.
Depending on the morphology of the flower, a pollen sac called a pollinia is attached to the head or abdomen of the male.
18.
I even think I see full pollen sacs on it's leg, so it looks like it's been busy gathering food / pollinating flowers.
19.
Pollen is grouped into complex structures called pollinia ( or " pollen sacs " ), rather than being individual grains or tetrads, as is typical for most plants.
20.
Sack-Shaped Catasetum ( " Catasetum saccatum " ), a tropical South American species, discussed by Darwin, actually launches its viscid pollen sacs with explosive force, when an insect touches a seta.
