Unformatted text preview: se the sporophyte Seeds Seeds
all seed plants are heterosporous • two groups of plants have seeds: gymnosperms and angiosperms
• Gymnosperms Gymnosperms
• gymnosperm – “naked seed” • • • ovule not covered at time of pollination no true fruits no flowers Gymnosperms Gymnosperms
Not clear yet whether living gymnosperms form a clade or a grade • 4 extant phyla
• • • • Phylum Cycadophyta…Cycads Phylum Ginkgophyta….Ginkgo (maidenhair trees) Phylum Gnetophyta…Gnetophytes Phylum Coniferophyta…Conifers Task B1: Survey of Gymnosperms Task B1: Survey of Gymnosperms
• Phylum Cycadophyta • examine Zamia and Cycas • note structures and terms from lab manual • Phylum Ginkgophyta • examine Ginkgo biloba parts • maidenhair trees planted in many places around campus, such as along College in front of Samford Hall, and at the library • note dioecious nature (separate male and female plants) • note structures, terms, and figure in lab manual Task B1: Sur...
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