Pollen Tube??

This is a photo of a pistil from an Alsobia 'Chiapas' that I put some pollen on. I wasn't expecting to see anything all that exciting but if you look slightly to the right of center on the picture the pistil shows a circular "hole". I was wondering if I found something interesting or not. When appropriate pollen gets on a pistil all sorts of cool things happen (such as the formation of pollen tubes), but I'm not sure IF you can see a pollen tube or not, and below the fine folks at Wikipedia tell us about pollen tubes, but they don't say if they are visible. I wonder.....?????


"Once a pollen grain settles on a compatible pistil, it germinates in response to a sugary fluid secreted by the mature stigma. Lipids at the surface of the stigma stimulate pollen tube growth for compatible pollen. Plants that are self-sterile inhibit the pollen grains from their own flowers from growing pollen tubes. The presence of multiple grains of pollen has been observed to stimulate quicker pollen tube growth in some plants. The vegetative cell then produces the pollen tube, a tubular protrusion from the pollen grain, which carries the sperm cells within its cytoplasm. This tube is the transportation medium of the male gamete to reach the egg cell.
The germinated pollen tube must then drill its way through the nutrient-rich style and curl to the bottom of the ovary to reach the ovule. Once the pollen tube successfully attains an ovule, it delivers the two sperm cells with a burst. One of them fertilizes the female gamete (the egg cell) to form an embryo, which will become the future plant. And the other one fuses with both polar nuclei of the central cell to form the endosperm, which serves as the embryo's food supply. The endosperm is rich in starch, proteins and oils and is a major source of human food (e.g., wheat, barley, rye, oats, corn). Finally, the ovary will develop into a fruit and the ovules will develop into seeds."