The gymnosperms are a group of seed-producing plants that includes conifers, cycads, Ginkgo, and Gnetales. The term "gymnosperm" comes from the Greek word gymnospermos (γυμνόσπερμος), meaning "naked seeds", after the unenclosed condition of their seeds (called ovules in their unfertilized state). Their naked condition stands in contrast to the seeds and ovules of flowering plants (angiosperms), which are enclosed within an ovary. Gymnosperm seeds develop either on the surface of scales or leaves, often modified to form cones, or at the end of short stalks as in Ginkgo.
The gymnosperms and angiosperms together compose the spermatophytes or seed plants. By far the largest group of living gymnosperms is the conifers (pines, cypresses, and relatives), followed by cycads, Gnetophytes (Gnetum, Ephedra and Welwitschia), and Ginkgo (a single living species).
In Walking with... SeriesEdit
Conifers, ferns, and other gymnosperm plants were used as background for several WWD episodes, including Time of the Titans, Spirits of the Ice Forest and Death of a Dynasty. They were filmed live, creating a more convincing atmosphere for the series.
This episode features modern conifer trees in the background, creating a more realistic atmosphere for the episode.
This episode used various gymnosperm plants for its background - mostly ferns in the first half (Carboniferous) and conifer trees (early Permian) in the second. They were filmed live, creating a more realistic atmosphere for the episode.