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 srbecensis	Knobloch (1984), Pl. X, fig. 1	EK133
Kerhartisporites srbecensis	Knobloch (1984), Pl. X, fig. 3	EK132
Kerhartisporites srbecensis	Knobloch (1984), Pl. X, fig. 6	EK149
Korhartisporites kleinii	Knobloch (1984), Pl. II, fig. 7	EK67
Laveineopteris bohemica		ZŠ430
Laveineopteris bohemica		ZŠ820
Laveineopteris bohemica		ZŠ429
Laveineopteris bohemica		ZŠ842
Laveineopteris bohemica		ZŠ821
Laveineopteris bohemica		ZŠ843
Laveineopteris loshii		ZŠ427
Laveineopteris loshii		ZŠ426
Laveineopteris loshii		ZŠ428
Laveineopteris loskii		ZŠ438
Laveineopteris lubnensis Havlena		ZŠ435
Laveineopteris lubnensis Havlena		ZŠ433
Laveineopteris lubnensis Havlena		ZŠ432
Laveineopteris lubnensis Havlena		ZŠ434
Laveineopteris lubnensis Havlena		ZŠ436
Laveineopteris lubnensis Havlena		ZŠ431

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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]