Saccus is a related term of saccate.

In botany terms the difference between saccate and saccus

is that saccate is of a pollen grain that has one or more sacci while saccus is a bladder or wing-like structure found on the pollen grains of many species of conifer. The shape or number of the sacci on a pollen grain can help identify the species it came from.

As an adjective saccate

is shaped like a pouch or sac.

As a noun saccus is

a bladder or wing-like structure found on the pollen grains of many species of conifer. The shape or number of the sacci on a pollen grain can help identify the species it came from.