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

Alethopteris urophylla Brongniart	Šimůnek (1996a), Pl. XII, fig. 5,	ZŠ11
Alethopteris valida	Šimůnek (1996a), Pl. XXI, fig. 1	ZŠ27
Alethopteris valida	Šimůnek (1996a), Pl. XXI, fig. 2.	ZŠ28
Alethopteris valida	Šimůnek (1996a), Pl. XX, fig. 2	ZŠ21
Alethopteris valida	Šimůnek (1996a), Pl. XX, fig. 1	ZŠ26
Alethopteris valida	Šimůnek (1996a), Pl. XVI, fig. 5	ZŠ23
Alethopteris valida	Šimůnek (1996a), Pl. XIX, fig. 1	ZŠ25
Alethopteris valida	Šimůnek (1996a), Pl. XV, fig. 7	ZŠ19
Alethopteris valida	Šimůnek (1996a), Pl. XVIII, fig. 1	ZŠ24
Alethopteris valida	Šimůnek (1996a), Pl. XV, fig. 8	ZŠ20
Alethopteris valida	Šimůnek (1992), Pl. XVI, fig. 4	ZŠ22
Alethopteris zeilleri	Šimůnek (2022), PL. 1, Fig. 2	ZŠ882
Alethopteris zeilleri	Šimůnek (1989), Pl. VII, fig. 5.	YA1279
Alethopteris zeilleri		YA1282
Alethopteris zeilleri	Šimůnek (1989), Pl. III, fig. 4	YA1277
Alethopteris zeilleri		YA1281
Alethopteris zeilleri	Šimůnek (1989), Pl. VII, fig. 1	YA1278
Araucaria		KP1192
Arnhardtia mouretii	Šimůnek et al. (2017), Pl. 2, fig. 9	ZŠ637
Arnhardtia scheibei		ZŠ722

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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]