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

Lesleya		ZŠ510
Lesleya		ZŠ509
Lesleya		ZŠ507
Lesleya	Šimůnek (1996b), Pl. VI, fig. 4, 5	ZŠ68
Lesleya	Šimůnek (1996b), Pl. IV, fig. 3	ZŠ65
Lesleya	Šimůnek (1996b), Pl. IV, fig. 2	ZŠ64
Lesleya	Šimůnek (1996b), Pl. II, fig. 1	ZŠ63
Lesleya	?imůnek (1996b), Pl. IV, fig. 4	ZŠ66
Lesleya	?imůnek (1996b), Pl. V, fig. 1	ZŠ67
Linopteris neuropteroides (Gutbier, 1855)	in prep. Šimůnek (2020)fig. 3G	ZŠ847
Linopteris obliqua (Bunbury, 1847)	in prep. Šimůnek (2020)fig. 7A	ZŠ849
Linopteris		ZŠ804
Lyginodendron	AD Bůžek (1971)	ČB52
Lyginopteris bauemleri		p4651
Lyginopteris fragilis		p4657
Lyginopteris stangeri		p4648
Mixoneura osmundaeformis		ZŠ173
Mixoneura osmundaeformis		ZŠ172
Mixoneura praeovata		WA133
Mixoneura	Šimůnek a Martínek (2009), Pl. 2, fig. 3	ZŠ180

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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]