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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


 

YA1278
Alethopteris zeilleri YA1278
ZS_212
Cordaites principalis ZŠ212
ZS_298
Cordaites Unger, 1850 ZŠ298
ZS_199
Culmitzschia parvifolia ZŠ199
ZS_195
Culmitzschia speciosa ZŠ195
ZS_61
Neurodontopteris auriculata ZŠ61
ZS_318
Pseudomariopteris ribeyronii ZŠ318
C_B368
Taxodium dubium ČB368
WA64
Trigonocarpus WA64
 

In the Virtual Museum there are total 1127 samples

Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]