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Seeds Plants I : Seed Plants without Flowers ("Gymnosperms"),…
Seeds Plants I : Seed Plants without Flowers ("Gymnosperms")
Concepts
Pyconoxylic wood
Lignophytes
Spermatophytes
Gynosperms
Manoxylic wood
Agniosperms
Division Cycadophyta : Cycads
Cycas revoluta
Zamia floridana
Macrozamia
Division Progymnospermophyta : Progymnosperms
Aneurophytales
Protopteridium
Proteokalon
Aneurophyton
Archaeopteridales
Siphonostele
Archaeopteris
heterosporous
Evolution of seeds
Microphyle
Pollen chamber
integument
coniferophtya
bear cones
Reproductive activities take place
long shoots
tiny papery leaves
Simple cones
pollen cones
single shots
leaves
perrnial
needle shaped
suspensor
pushes cells into megagametophytes
proembryo
develops in the embryo
Gnetophyta
leaves
reduced and scale like
small shrubs
broad leaves
desert region
gynosperms
Anthophytes
Division cycadenoidophyta : cycadeoids
Microsporophylls
extinct
megasporophylls
location
cluster of megasporophylls
curved upwards
Ginkgophyta
short roots
lack axial parenchyma
looks dicot
reproduction
dioecious and gymnospermous
Division of pterdospermophyta
lyginopteris
Stenomyelon
calamopitys
woody plants
