pollen-tubes

Thus in plants, the office of the pistil is to allow the pollen-tubes to reach the ovules within the ovarium.

Darwin and the vermiform appendix - The Panda's Thumb 2009

These positions seem at first purely morphological, or of no physiological signification; but Dr. Hooker informs me that within the same ovarium, the upper ovules alone in some cases, and in other cases the lower ones alone are fertilised; and he suggests that this probably depends on the direction in which the pollen-tubes enter the ovarium.

VII. Miscellaneous Objections to the Theory of Natural Selection 1909

This impregnation is brought about by means of tubes (pollen-tubes) which issue from the pollen-grains adhering to the stigma, and penetrate through the tissues until they reach the ovary.

Glossary of the Principal Scientific Terms Used in the Present Volume 1909

It has also been observed that when the pollen of one species is placed on the stigma of a distantly allied species, though the pollen-tubes protrude, they do not penetrate the stigmatic surface.

IX. Hybridism. Origin and Causes of the Sterility of First Crosses and of Hybrids 1909

There must sometimes be a physical impossibility in the male element reaching the ovule, as would be the case with a plant having a pistil too long for the pollen-tubes to reach the ovarium.

IX. Hybridism. Origin and Causes of the Sterility of First Crosses and of Hybrids 1909

Thus in plants, the office of the pistil is to allow the pollen-tubes to reach the ovules within the ovarium.

XIV. Mutual Affinities of Organic Beings: Morphology-Embryology-Rudimentary Organs. Rudimentary, Atrophied, and Aborted Organs 1909

From this the pollen-tubes grow down and the pollen-nucleus of a tube fertilises the egg-cell in an ovule, so that the possible seeds become real seeds, for it is only a fraction of them that the Yucca Moth has destroyed by using them as cradles for her eggs.

The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told J. Arthur Thomson 1897

But it is reached by only a very few pollen-tubes, and is therefore always incompletely fertilized.

Species and Varieties, Their Origin by Mutation Hugo de Vries 1891

There must sometimes be a physical impossibility in the male element reaching the ovule, as would be the case with a plant having a pistil too long for the pollen-tubes to reach the ovarium.

On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life 1859

Thus in plants, the office of the pistil is to allow the pollen-tubes to reach the ovules protected in the ovarium at its base.

On the Origin of Species~ Chapter 13 (historical) Charles Darwin 1859