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Chapter 21: Seeds Plants (conifers (proembryo (develop in the embryo),…
Chapter 21: Seeds Plants
progymnosperms
conifers and cycads
archaeopteridales
more derived progymnosperm
aneurophytales
contains more relictual progymnosperm
Evolution of seeds
integument
megasproangium surrounded by a layer of tissue
projected upward
pollen chamber
holding area for pollen
micropyle
hole in the integument that permitted sperm to swim to egg
conifers
proembryo
develop in the embryo
ovuliferous scale
megasporophylls are fused laterally
compound cones
short shoots
long needle leaves
long shoots
tiny paper leaves