What structure do angiosperms have and gymnosperms lack?

Angiosperms are characterized by the following features: true stems and roots, trichomes, pollen tubes, anthers, stamens, pollination modifications to flowers, and seeds with mesocarp, endocarp, and endosperm to nourish the seed.

They have true vessel elements, xylem and phloem, but lack tough bark or wood (no tough lignin or cork cambium), making them flimsier; they also produce fruits, which have fleshy layers that protect the seed, nourish the seed, or draw animals to eat or spread the seed. Stamen, anthers, pollen tubes, and other parts are modified to fit the angiosperms method of either wind, insect, or mammal pollination.

Thus, there are a few items.

Gymnosperms produce cones as their reproductive structures; angiosperms have flowers, which are reproductive structures containing the male and female reproductive organs.