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

Walchia goeppertiana		ZŠ628
Walchia goeppertiana		ZŠ717
Walchia goeppertiana		ZŠ649
Walchia goeppertiana		ZŠ658
Walchia (Lebachia) piniformis		p5071
Walchia (Lebachia) piniformis		p5067
Walchia nov. sp. B	Šimůnek (2022), PL. 8, Fig. 5	ZŠ904
Walchia piniformis		ZŠ631
Walchia piniformis		ZŠ731
Walchia piniformis		ZŠ740
Walchia piniformis		ZŠ645
Walchia piniformis		ZŠ737
Walchia piniformis		ZŠ736
Walchia piniformis		ZŠ689
Walchia piniformis	Šimůnek et al. (2017), Pl. 4, fig. 3	ZŠ644
Walchia piniformis	Šimůnek et al. (2017), Pl. 5, fig. 1	ZŠ663
Walchia piniformis		ZŠ694
Walchia piniformis		ZŠ718
Walchia piniformis	Šimůnek a Martínek (2009), Pl. 1, fig. 9	ZŠ176
Walchia Budil, 2011	Šimůnek et al. (2017), Pl. 5, fig. 2	ZŠ637

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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]