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

Rtynepteris pilosa	Šimůnek (1996a), Pl. XXIII, fig. 1	ZŠ31
Rtynepteris pilosa	Šimůnek (1996a), Pl. XXIII, fig. 7, 8	ZŠ33
Rtynepteris pilosa	Šimůnek (1996a), Pl. XXIII, fig. 2	ZŠ32
Rtynepteris pilosa	Šimůnek (1996a), Pl. XXIV, fig. 1	ZŠ34
Samaropsis newberryi	Šimůnek at Libertín (2006), Pl. V, fig. 2 (b)	ZŠ114
Samaropsis newberryi		ZŠ148
Samaropsis newberryi		ZŠ153
Samaropsis newberryi		ZŠ157
Samaropsis newberryi		ZŠ162
Samaropsis newberryi		ZŠ165
Samaropsis newberryi		ZŠ166
Samaropsis newberryi		ZŠ156
Samaropsis newberryi		ZŠ158
Samaropsis newberryi		ZŠ159
Samaropsis newberryi		ZŠ160
Samaropsis newberryi	Šimůnek a Libertín (2006), Pl. V, fig. 2 (b)	ZŠ108
Samaropsis newberryi		ZŠ110
Samaropsis newberryi		ZŠ150
Samaropsis newberryi		ZŠ154
Samaropsis newberryi		ZŠ145

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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]