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14 Cards in this Set
- Front
- Back
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What seedless vascular plants demonstrate homospory
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Equistum (horsetails), of phylum Arthrophyta
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What seedless vascular plant demonstrate heterospory?
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Selaginella of phylum Lycophyta
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What organs are specific to heterospory?
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Microspore and megaspore. All seedplants are heterosporus!!
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Whats the diff btw gymnosperm and angiosperm?
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"naked" seed b/c ovule not covered in time of pollination. No true fruits or flowers. No one knows if its a clade or grade
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What are the four phyla of gymnosperm?
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(1) Cycadophyta (Cycads)
(2) Ginkgophyta Ginkgo (maidenhair trees) (3) Gnetophyta (Gnetophytes) (4) Coniferophyta (Conifers) |
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Cycadophyta
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Dioecious, w/ fern like leaves and strobili. Both pollen cones and ovulate cones. Example: Zamia(natural) and Cyas
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Ginkophyta
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based on ginko biloba (maidenhair tree). Only one alive
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Gnetophyta
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odd and look like Anthophyta (horsetails), examine ephera (congestive drug ephederine)
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Coniferophyta
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most popular, (cone bearing plants), like Pinus
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What time period were gymnosperm dominant
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Carboniferous period 300 mya
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University Arboretum
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Collection of plants and keys to use for identification
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Structure of Equistium (homospory)
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Strobilus. (sporangiophore, sporangia). Elaters- aid in the dispersal of spores (they uncoil after abosrbtion of moisture)
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Strobili
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Strobilus. (sporangiophore, sporangia). Elaters- aid in the dispersal of spores (they uncoil after abosrbtion of moisture)
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What is dehisscince?
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Spore release in Selaginella (heterospory)
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