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Gymnosperms (Chapter 22), Progymnosperm wood similar to that of conifers…
Gymnosperms (Chapter 22)
Division Progymnospermophyta: Progymnosperms #
Archaeopteridales- more derived progymnosperms. Trees up to 8.4 m tall w/ abundant wood & secondary phloem.
Aneurophytales- more relictual progymnosperms. Varied in stature from shrubs to large trees 12m tall.
Division Pteridospermophyta: Seed Ferns
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Seed fern wood was manoxylic. # #
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Division Cycadophyta: Cycads
Frequently confused with ferns or young palm leaves because of stout trunks with pinnately compound leaves. Short plants, less than 1 or 2m tall, but Macrozamia can reach 18m
Unlike seed ferns, cycad foliage leaves don't bear ovules.
Division Ginkgophyta: Maidenhair Tree
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Looks very much like a large dicot tree, with a stout trunk and many branches.
Division Cycadeoidophyta: Cycadeoids #
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Division Gnetophyta
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Mostly vines or small shrubs, with broad leaves, similar to those of dicots.
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