24-gymnosplout-11sp

24-gymnosplout-11sp - A. progymnosperms B. seed ferns III....

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AG V03/BIOL V23 Plant Biology Lecture: Gymnosperms © copyright 2009 Marta D. de Jesus Gymnosperms I. General characteristics A. sporophyte B. gametophytes 1. Male (micro) gametophyte 2 prothallial cells 1 tube cell 1 generative cell 2. Female (mega) gametophyte megaspore cells archegonia C. heterospory 1. monoecious 2. dioecious D. depend on micropyle E. sperm F. seeds 1. tissues (1N): (2N- mom) nucellus integuments (2N- baby) 2. cotyledons G. organs H. xylem cells I. wounds
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Unformatted text preview: A. progymnosperms B. seed ferns III. P: Cycadophyta = cycads sago palms IV. P: Ginkgophyta = ginkgoes Ginkgo biloba V. P: Coniferophyta = conifers A. large group So. Hemisphere: Podocarpus , Agathis , Araucaria B. dominate forests C. leaves xerophytic adaptations D. some are dioecious E. sperm F. economically very valuable G. some of record holders VI. P: Gnetophyta = gnetophytes 3 very different genera 1. Ephedra 2. Gnetum 3. Welwitschia...
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24-gymnosplout-11sp - A. progymnosperms B. seed ferns III....

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