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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
Kerhartisporites kleiniiKnobloch (1984), Pl. II, fig. 6 EK202
Kerhartisporites kleiniiKnobloch (1984), Pl. II, fig. 5 EK170
Kerhartisporites kleiniiKnobloch (1984), Pl. X, fig. 12 EK161
Kerhartisporites kleiniiKnobloch (1984), Pl. X, fig. 7 EK121
Kerhartisporites kleiniiKnobloch (1984), Pl. X, fig. 10 EK176
Kerhartisporites kleiniiKnobloch (1984), Pl. X, fig. 8 EK178
Kerhartisporites kleiniiKnobloch (1984), Pl. X, fig. 11 EK159
Kerhartisporites srbecensisKnobloch (1984), Pl. X, fig. 5 EK134
Kerhartisporites srbecensisKnobloch (1984), Pl. X, fig. 2 EK135
Kerhartisporites srbecensisKnobloch (1984), Pl. X, fig. 4 EK148
Kerhartisporites srbecensisKnobloch (1984), Pl. X, fig. 1 EK133
Kerhartisporites srbecensisKnobloch (1984), Pl. X, fig. 3 EK132
Kerhartisporites srbecensisKnobloch (1984), Pl. X, fig. 6 EK149
Korhartisporites kleiniiKnobloch (1984), Pl. II, fig. 7 EK67
Laveineopteris bohemica ZŠ430
Laveineopteris bohemica ZŠ820
Laveineopteris bohemica ZŠ429
Laveineopteris bohemica ZŠ842
Laveineopteris bohemica ZŠ821
Laveineopteris bohemica ZŠ843
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]