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Pollen Cones Produce the male Gametophytes. Pollen Grains Male Gametophyte. Seed Cones Produce Female Gametophytes. Ovule Structure in seed cone in which female gameteophytes develop. Pollen Tube Structure grown by a pollen grain; contains two haploid sperm nuclei. Sepals Outermost circle of a flower that encloses a bud before it opens and protects the flower while it is developing. Petals Brightly-coloured structure just inside the sepals; attracts insects and other pollinators to the flower. Stamen Male part of the flower; made up of an anther and a filament. Filament A long thin structure that supports an anther. Anther Flower structure in which haploid male gametophytes are produced. Carpels Innermost part of the flower that produces the female gametophyte. Ovary A flower structure that contains one or more ovules from which female gametophytes are produced. Style Narrow stalk of the carpel in a flower. Stigma Sticky portion at the top of the style where pollen grains frequently land. Embryo Early developmental stage of a sporophyte plant. Endosperm Food-rich tissue that nourishes a seedling as it grows. Gametophyte Haploid, or gamete producing, phase of an organism. Sporophyte Diploid, or spore producing, phase of an organism. Bryophytes Nonvascula plant; some examples are mosses and their relatives. Angiosperm Flowering plant. Gymnosperm Seed plants that bears its seeds directly on the surface of cones.