Origin of pollen tube
Examples from the Web for pollen tube
Historical Examples of pollen tube
The pollen-tube is constant because it has proved to be indispensable.Darwin and Modern Science
A.C. Seward and Others
The male-cells are carried to their destination in the tip of the pollen-tube.
The pollen-tube must penetrate the whole length of each thread of corn-silk in order to reach the ovules.
It is down these style-branches that the pollen-tube passes on its way to the ovules or embryo seeds.The Apple-Tree
L. H. Bailey
The branches of the stigma are very thin, formed apparently of three rows of cells of hardly greater diameter than pollen-tube.More Letters of Charles Darwin Volume II