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Division Progymnospermophyta: Progymnosperms (Evolution of Seeds…
Division Progymnospermophyta: Progymnosperms
progymnosperms - third plant to evolve from trimerophytes
Evolution of Seeds
megasporangium was covered in a layer of tissue called integument
had a hole called a micropyle which allowed sperm cells in
pollen chamber or holding chamber
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Archaeopteridales
reproduction was heterosporous
very tall and have secondary xylem
Aneurophytales
contains more relictual progymnosperms
