| 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 bohemica | | | | YA1276 | Alethopteris bohemica | Šimůnek (1989), Pl. 1, fig. 1 | | | YA1273 | Alethopteris bohemica | | | | YA1280 | Alethopteris bohemica | Šimůnek (1989), Pl. II, fig. 3. | | | YA1283 | Alethopteris bohemica | Šimůnek (2022), PL. 1, Fig. 7 | | | ZŠ879 | Alethopteris bohemica | | | | YA1274 | Alethopteris bohemica | Šimůnek (1989), Pl. I, fig. 2 | | | YA1275 | Alethopteris davreuxii | Šimůnek (1996a), Pl. I, fig. 9 | | | ZŠ1 | Alethopteris decurrens | Šimůnek (1996a), Pl. III, fig. 2 | | | ZŠ3 | Alethopteris decurrens | Šimůnek (1996a), Pl. III, fig. 1 | | | ZŠ2 | Alethopteris distantinervosa (Wagner, 1968) | Šimůnek (1988): Pl. III, fig. 1; Šim.-Cleal (2002) Fig. 2e,f; in prep. Šimůnek (2020)fig. 4A | | | ZŠ850 | Alethopteris grandini | Šimůnek (1996a), Pl. IV, fig. 7 | | | ZŠ6 | Alethopteris grandini | Šimůnek (1996a), Pl. IV, fig. 6 | | | ZŠ5 | Alethopteris grandini | Šimůnek (1996a), Pl. IV, fig. 4 | | | ZŠ4 | Alethopteris grandinioides | AD, Šimůnek (1988) | | | YA1385 | Alethopteris idae | Šimůnek (1996a), Pl. VII, fig. 1-4 | | | ZŠ7 | Alethopteris jongmanii | Šimůnek (1996a), Pl. VIII, fig. 2 | | | ZŠ8 | Alethopteris lancifolia | Šimůnek (1996a), Pl. IX, fig. 6 | | | ZŠ9 | Alethopteris leonensis | | | | ZŠ512 | Alethopteris lonchilifolia | Šimůnek (1996a), Pl. XIV, fig. 5 | | | ZŠ15 |
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