He describes the standard arrangement in angiosperms the nucellus joined by the chalaza to the integuments, which surround the nucellus except at the micropyle, through which the pollen tubes enter.
32.
When a pollen grain adheres to the stigma of a carpel it germinates, developing a pollen tube that grows through the tissues of the style, entering the ovule through the micropyle.
33.
"Drosophila melanogaster " spermatozoa contains an alpha-l-fucosidase that might be involved in fertilisation by interacting with alpha-l-fucose residues on the micropyle of the eggshell.
34.
Each egg contains a number of tiny funnel-shaped openings at one end, called " micropyles "; the purpose of these holes is to allow sperm to enter and fertilize the egg.
35.
In gymnosperms ( e . g ., conifers ), the pollen is drawn into the ovule on a drop of fluid that exudes out of the micropyle, the so-called pollination drop mechanism.
36.
"Palaeoaldrovanda " is not a seed with a basic micropyle or chalaza . [ . . . ] Our new interpretation of " Palaeoaldrovanda " significantly influences the current view of the family Droseraceae.
37.
Other seed appendages include the raphe ( a ridge ), wings, "'caruncles "'( a soft spongy outgrowth from the outer integument in the vicinity of the micropyle ), spines, or tubercles.
38.
The cell closest to the micropyle opening of the integuments differentiates into the egg cell, with two "'synergid cells "'by its side that are involved in the production of signals that guide the pollen tube.
39.
In the field of entomology, he conducted investigations into the micropyle and fertilization of insect eggs, the reproduction and development involving members of Pupipara, parthenogenesis among insects, and studies on the anatomy and life history of the honeybee.
40.
In later, Pennsylvanian-age ovules such as " Lagenostoma " the nucellus became almost entirely encased by and fused to the integument, leaving just the small distal opening in the integument known as the micropyle through which pollen passed.
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