| 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
| Doliostrobus certus | | | | ČB548 | | Doliostrobus certus | Bůžek, Holý, Kvaček (1968) Pl.33,fig.7 - protiotisk k Uc-9-5/4 | | | ČB769 | | Doliostrobus certus | Bůžek, Holý, Kvaček (1968)textf.1, Pl. 32, fug. 3; Bůžek, Holý, Kvaček (1969) Pl. 1, fug. 5 | | | ČB773 | | Doliostrobus certus | Bůžek, Holý, Kvaček (1968)Pl.32,f.1;Pl.34,f.1,4;Pl.35,f.2; Bůžek,Holý,Kvaček(1969)Pl.1,f.1;Pl.2,f.1 | | | ČB782 | | Doliostrobus certus | AD Bůžek, Holý, Kvaček (1968), Kvaček (2002) | | | ČB759 | | Doliostrobus certus | Bůžek, Holý, Kvaček (1968) Pl. 33, fig. 17 | | | ČB763 | | Doliostrobus certus | AD Bůžek, Holý, Kvaček (1968) | | | ČB765 | | Doliostrobus certus | Bůžek, Holý, Kvaček (1968) Pl. 32, fig. 10, 11 | | | ČB780 | | Doliostrobus certus | Bůžek, Holý, Kvaček (1968) nevyobrazen | | | ČB781 | | Doliostrobus certus | Bůžek, Holý, Kvaček (1968) nevyobrazeno | | | ČB783 | | Doliostrobus certus | Bůžek, Holý, Kvaček (1968) Pl. 33, fig. 3 | | | ČB788 | | Doliostrobus certus | AD Bůžek, Holý, Kvaček (1968) | | | ČB764 | | Doliostrobus certus | Bůžek, Holý, Kvaček (1968) nevyobr.; Kvaček (2002)Pl.3,fig.4 | | | ČB768 | | Doliostrobus certus | Bů?ek, Holý, Kvaček (1968) Pl. 33, fig. 8 | | | ČB760 | | Doliostrobus certus | Bůžek, Holý, Kvaček (1968) nevyobrazeno | | | ČB776 | | Doliostrobus certus | Bůžek, Holý, Kvaček (1968) nevyobrazeno | | | ČB777 | | Doliostrobus certus | Bůžek, Holý, Kvaček (1968) nevyobrazeno | | | ČB778 | | Doliostrobus certus | Bůžek, Holý, Kvaček (1968) nevyobrazeno | | | ČB766 | | Doliostrobus certus | AD Bů?ek, Holý, Kvaček (1968) | | | ČB761 | | Doliostrobus certus | Bůžek, Holý, Kvaček (1968) Pl. 32, fig. 6; Kvaček (2002)Pl.3,fig.2 | | | ČB767 |
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