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Seed Plants I: seed plants without flowers (gymnosperms) (Division…
Seed Plants I: seed plants without flowers (gymnosperms)
Division progymnospermophyta: Progymnosperms
Aneurophytes
More relictual
Shrubs-Large trees🌳🌲
Vascular cambium & secondary growth
Archaeopteridales
Trees w/ abundant wood🌲
Fronds resembles fern leaves
Heterosporous
Evolution of seeds
Spores can’t be identified w/
gametophytes except when
gametophyte is microscopic
and develops within cell wall
Division Pteridospermophyta: seed ferns
Upper Devonian period
Not all closely related
Division Coniferophyta: conifers
Giant redwoods
Never vines, herbs, or annuals
Simple venation
Long shoots & short shoots
Simple cones vs. compound cones
Division Cycadophyta:Cycads
Confused with ferns and palm trees
Stout trunks
Pinnately compound leaves
Short Plants
Prized ornamentals
Division Cycadeoidophyta: Cycadeoids
All extinct
Features almost identical to cycads
Division Ginkgophyta: Maidenhair tree
Single living species
Ginkgo biloba
Unusual
Division Gnetophyta
Gymnosperms with vessels in wood
Compound pollen cones
Spindle shaped pollen
