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Gymnosperms- Chapter 18

Gymnosperms- Chapter 18. Naked versus Enclosed Seed Plants. Gymnosperms Gymno- gr. naked. Sperma- gr. seed . Angiosperms Angeion- gr. vessel . Sperma- gr. seed. Extant Gymnosperms. Match the common name on the right to the phylum on the left. 1) Cycadophyta a. ginkgo

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Gymnosperms- Chapter 18

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  1. Gymnosperms- Chapter 18

  2. Naked versus Enclosed Seed Plants • Gymnosperms • Gymno- gr. naked. • Sperma- gr. seed. • Angiosperms • Angeion- gr. vessel. • Sperma- gr. seed.

  3. Extant Gymnosperms • Match the common name on the right to the phylum on the left. • 1) Cycadophyta a. ginkgo • 2) Ginkgophyta b. conifers • 3) Coniferophyta c. cycads • 4) Gnetophyta d. gnetophytes

  4. Cycadophyta • Cycas- gr. palm. • Tracheids, but no vessel elements. • Sperm present, multiflagellated. • Palmlike leaves. • Pollen tube does not fuse with the egg cell. • Ovulate (megasporangiate) & microsporangiate cones simple & on separate plants. • 11 genera & 140 species. • Examples- Cycas & Zamia. Zamia

  5. Cycas

  6. Ginkgophyta • Yin- ch. silver, hing- ch. apricot. • Tracheids, but no vessel elements. • Sperm present, multiflagellated. • Fan-shaped leaves. • Pollen tube does not fuse with the egg cell. • Ovulate & microsporangiate cones on separate plants; fleshy-coated seeds. • 1 genus & 1 species. • Examples- Gingkobiloba= maidenhair tree.

  7. Coniferophyta • Con- gr. cone, fer- L. bear. • Tracheids, but no vessel elements. • Sperm not motile. • Needlelike or scalelike leaves. • Pollen tube fuses with egg cell. • Ovulate & microsporangiate cones on same plant; ovulate cones compound. • 70 genera & 630 species. • Examples- Pinus, Picea, Juniperus, Abies, Cupressus.

  8. True or False. These winglike structures are female pollen grains.-------------------------->

  9. Pinus- pine (Pinaceae).

  10. Metasequoia- Dawn redwood.

  11. Wollemianobilis- Wollemi pine.

  12. Gnetophyta • Gneto- Malay gnenom. • Tracheids and vessel elements. • Sperm not motile. • Scalelike, leaflike, broad and leathery leaves. • Pollen tube fuses with egg cell. • Ovulate & microsporangiate cones compound & mostly borne on separate plants. • 3 genera & 70 species. • Examples- Gnetum, Ephedra, Welwitschia.

  13. Gnetum

  14. Ephedra

  15. Welwitschia

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