Gnetophyta jpg
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Kalkplatte mit einer fossilen Pflanze Beschreibung In hoher Aufloesung anzeigen 1024x809 Pixel ca 425 KB

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Helmholtz Zentrum fuer Kulturtechnik Humboldt Universitaet zu Berlin Kalkplatte mit einer fossilen Pflanze In hoher Aufloesung anzeigen 1024x809 Pixel ca 425 KB

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macerated Ephedra stem macerations of Betula birch wood sections of Ephedra B Reproductive Structures The strobili of Gnetophyta are compound like the female conifer cone Most species of Ephedra are dioecious You probably saw

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fertilization are examples of parallel evolution Considering all their amazing similarities it seems quite plausible that the Gnetophyta and angiosperms may have had a common ancestor

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03gnetophyta ephedra jpg
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welwitschcotyls​ jpg
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welwitclaus gif 03 Jul 2001 09 22 72K welwitschcones gif 03 Jul 2001 09 22 65K welwitschcotyls jpg 03 Jul 2001 09 22 33K welwitschcotylssmall > 03 Jul 2001 09 22 10K

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are reduced to minute bract like organs that function only early in development however they are megaphylls The delicate branches are the chief photosynthetic organ of Ephedra Ephedra sp Whole plant Both the microstrobili and the megastrobili of Ephedra are compound structures in which the sporogenous organs are appendicular at the tip of the

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Ephedra sp Branch b the microstrobilus with protruding microsporophylls sterile bracteoles and microsporangia c mature and immature megastrobili with protruding micropylar tubes and cone bracts Examine the slide of the microstrobilus L S Note the microsporangia on the protuberant

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gnetaceae gnetum jpg
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Welwitschia And Ephedra Remarkable Genera Of Gymnosperms

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of Gnetophyta are compound like the female conifer cone Most species of Ephedra are dioecious You probably saw reproductive structures on the herbarium specimens you examined already male strobili microsporangiophore

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Ephedra jpg
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Cycads Gnetophyta Welwitschia Ephedra Conifers Pine juniper

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Pinophyta Pines Spruces Firs Hemlocks Cedars Cycadophyta the Cycads Ginkgophyta represented by Ginkgo biloba as the only species Gnetophyta including Ephedra photo and Welwitschia Gymnosperm Characteristics

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Gnetophyta Gnetum Ovulate plant Seed Welwitschia habit

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CH 22 Gymnosperms In this chapter you will learn about the differences between ferns and seed plants and then briefly discuss the geological history of gymnosperms The leaves roots and stems of pine