| 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
| Tenellisporites helios | Knobloch (1984), Pl. XIV, fig. 8 | | | EK99 | | Tenellisporites helios | Knobloch (1984), Pl. XIV, fig. 11 | | | EK94 | | Tenellisporites helios | Knobloch (1984), Pl. XIV, fig. 4 | | | EK92 | | Tenellisporites helios | Knobloch (1984), Pl. XIV, fig. 9 | | | EK83 | | Tenellisporites helios | Knobloch (1984), Pl. XIV, fig. 6 | | | EK101 | | Tenellisporites helios | Knobloch (1984), Pl. XIV, fig. 5 | | | EK98 | | Tenellisporites helios | Knobloch (1980), Pl. XIV, fig. 6 | | | EK93 | | Tenellisporites helios | Knobloch (1984), Pl. XIV, fig. 10 | | | EK75 | | Tenellisporites helios | Knobloch (1984), Pl. XIV, fig. 2 | | | EK95 | | Tenellisporites helios | Knobloch (1984), Pl. XIV, fig. 3 | | | EK96 | | Tetraclinis salicornioides (Ung.) Z. Kvaček | Bůžek, Holý, Kvaček (1976) | | | ČB723 | | Tetraclinis salicornioides (Ung.) Z. Kvaček | Bůžek, Holý, Kvaček (1976) Pl. II, fig. 3 | | | ČB671 | | Tetraclinis salicornioides (Ung.) Z. Kvaček | Bůžek, Holý, Kvaček (1976) nevyobrazeno | | | ČB707 | | Tetraclinis salicornioides (Ung.) Z. Kvaček | | | | EK241 | | Tetraclinis salicornioides (Ung.) Z. Kvaček | | | | EK245 | | Tetraclinis salicornioides (Ung.) Z. Kvaček | Kvaček, Teodoridis, Zajícová (2015) Pl. 1, fig. 9 | | | EK242 | | Tetraclinis salicornioides (Ung.) Z. Kvaček | | | | EK244 | | Tetraclinis salicornioides (Ung.) Z. Kvaček | Kvaček, Teodoridis, Zajícová (2015) Pl. 1, fig. 8 | | | EK243 | | Tetraclinis salicornioides (Ung.) Z. Kvaček | | | | EK240 | | Thomasostrobus Budil, 2011 | | | | ZŠ307 |
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