| Gymnosperms
The gymnosperms are a group of seed-bearing 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 or ovules of flowering plants (angiosperms), which are enclosed during pollination. Gymnosperm seeds develop either on the surface of scale- or leaf-like appendages of cones, or at the end of short stalks (Ginkgo).
The gymnosperms and angiosperms together comprise the spermatophytes or seed plants. By far the largest group of living gymnosperms are the conifers (pines, cypresses, and relatives), followed by cycads, Gnetales (Gnetophyta, Ephedra and Welwitschia), and Ginkgo (a single living species).
Source: http://en.wikipedia.org/wiki/Gymnosperms
Samaropsis newberryi | | | | ZŠ146 | Samaropsis newberryi | | | | ZŠ151 | Samaropsis newberryi | | | | ZŠ161 | Samaropsis newberryi | | | | ZŠ147 | Samaropsis newberryi | Šimůnek a Libertín (2006), Pl. IV, fig. 7 | | | ZŠ112 | Samaropsis newberryi | | | | ZŠ149 | Samaropsis newberryi | | | | ZŠ152 | Samaropsis newberryi | | | | ZŠ155 | Samaropsis newberryi | Šimůnek a Libertín (2006), Pl. V, fig. 1 (a) | | | ZŠ106 | Samaropsis newberryi | | | | ZŠ164 | Samaropsis newberryi | | | | ZŠ163 | Samaropsis newberryi | Šimůnek a Libertín (2006), Pl. IV, fig. 8 | | | ZŠ109 | Samaropsis newberryi | Šimůnek a Libertín (2006), Pl. IV, fig. 6 | | | ZŠ111 | Samaropsis newberryi | Šimůnek a Libertín (2006), Pl. IV, fig. 3 | | | ZŠ107 | Sequoia reichenbachi | | | | p3998 | Taxodioxylon gypsaceum (Goppert) Krausel | Mysliveček et al. (2021) Fig.3 D (DOI 10.3140/zpravy.geol.2021.9) | | | XYL4 | Taxodioxylon gypsaceum (Goppert) Krausel | Mysliveček et al. (2021) Fig.3 A (DOI 10.3140/zpravy.geol.2021.9) | | | XYL1 | Taxodioxylon gypsaceum (Goppert) Krausel | | | | XYL8 | Taxodioxylon gypsaceum (Goppert) Krausel | Mysliveček et al. (2021) Fig.3 C (DOI 10.3140/zpravy.geol.2021.9) | | | XYL3 | Taxodioxylon gypsaceum (Goppert) Krausel | Mysliveček et al. (2021) Fig.3 B (DOI 10.3140/zpravy.geol.2021.9) | | | XYL2 |
|