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 angustifolia	Orig. Šimůnek et al. (2017), Pl. 3, fig. 10	ZŠ643
Culmitzschia angustifolia		ZŠ698
Culmitzschia angustifolia	Šimůnek et al. (2017), Pl.3, fig. 9	ZŠ646
Culmitzschia angustifolia		ZŠ647
Culmitzschia frondosa	Šimůnek (2022), PL. 8, Fig. 2	ZŠ901
Culmitzschia frondosa	Šimůnek (2022), PL. 8, Fig. 3	ZŠ902
Culmitzschia frondosa		ZŠ906
Culmitzschia goeppertiana		ZŠ665
Culmitzschia goeppertiana		ZŠ666
Culmitzschia goeppertiana		ZŠ664
Culmitzschia parvifolia	Orig. Šimůnek et al. (2017), Pl. 3, fig. 10	ZŠ643
Culmitzschia parvifolia		ZŠ734
Culmitzschia parvifolia		ZŠ711
Culmitzschia parvifolia		ZŠ199
Culmitzschia parvifolia	Šimůnek et al. (2017), Pl. 3, fig. 8	ZŠ654
Culmitzschia parvifolia		ZŠ627
Culmitzschia parvifolia	Šimůnek a Martínek (2009), Pl. 3, fig. 4	ZŠ192
Culmitzschia parvifolia	Šimůnek a Martínek (2009), Pl. 2, fig. 8	ZŠ185
Culmitzschia parvifolia	Šimůnek a Martínek (2009), Pl. 2, fig. 7	ZŠ184
Culmitzschia parvifolia		ZŠ677

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Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]