pollen grain

This at once suggests the objection, how can the idioplasm, for instance, of a pollen grain be the same as that of a leaf?

Alighting on a new flower the insect rubs a pollen grain on a stigma ready to receive it, and lo!

Or we may think of the shrunken dark star as the germ-cell, the pollen-grain, of the cosmic organism.

It is obvious that a "tall" ovule has an equal chance of being fertilised by a "tall" or a "dwarf" pollen grain.

Each of the 2x dwarf ovules, again, has an equal chance of being fertilised by a "tall" or by a "dwarf" pollen grain.