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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


 

YA1273
Alethopteris bohemica YA1273
YA1275
Alethopteris bohemica YA1275
YA1274
Alethopteris bohemica YA1274
ZS_7
Alethopteris idae ZŠ7
ZS_14
Alethopteris lonchilifolia ZŠ14
ZS_13
Alethopteris lonchilifolia ZŠ13
ZS_15
Alethopteris lonchilifolia ZŠ15
ZS_17
Alethopteris refracta ZŠ17
ZS_16
Alethopteris refracta ZŠ16
ZS_11
Alethopteris urophylla Brongniart ZŠ11
ZS_10
Alethopteris urophylla Brongniart ZŠ10
ZS_12
Alethopteris urophylla Brongniart ZŠ12
ZS_23
Alethopteris valida ZŠ23
ZS_19
Alethopteris valida ZŠ19
ZS_24
Alethopteris valida ZŠ24
ZS_26
Alethopteris valida ZŠ26
ZS_25
Alethopteris valida ZŠ25
ZS_22
Alethopteris valida ZŠ22
YA1281
Alethopteris zeilleri YA1281
YA1279
Alethopteris zeilleri YA1279

In the Virtual Museum there are total 992 samples

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