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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
Culmitzschia parvifoliaŠimůnek a Martínek (2009), Pl. 2, fig. 4 ZŠ181
Culmitzschia speciosaŠimůnek a Martínek (2009), Pl. 3, fig. 3 ZŠ191
Culmitzschia speciosafoto ZŠ195
Culmitzschia speciosa ZŠ704
Culmitzschia speciosaŠimůnek et al. (2017), Pl. 4, fig. 2 ZŠ655
Culmitzschia speciosa ZŠ656
Culmitzschia speciosa ZŠ657
Culmitzschia speciosaOrig. Šimůnek et al. (2017), Pl. 3, fig. 10 ZŠ643
Culmitzschia speciosa ZŠ710
Cunningxhamites oxycedrusKnobloch (1967), Pl. XII, fig. 1 p4620
Dadoxylon p5102
Dadoxylon p5105
Dammarites klikovensis Knobloch, 1964AD, Knobloch (1964) p2975
Dammarites klikovensis Knobloch, 1964AD, Knobloch (1964) p3283
Dammarites klikovensis Knobloch, 1964AD, Knobloch (1964) p2970
Debeya bohemicaKnobloch (1964), Pl. 1, fig. 1 p2950
Debeya bohemicaKnobloch (1964), Pl. II, fig. 7 p1594
Dicksonites pluckeneti ZŠ867
Dicksonites pluckeneti ZŠ515
Dicksonites ZŠ516
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]