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Seed Plants I: Seed Plants without Flowers ("Gymnosperms")…
Seed Plants I: Seed Plants without Flowers ("Gymnosperms")
Division of Gymnosperm Plant Types
coniferophyta
Conifers
short shoots
long needle leaves
example
firs, pines, junipers
grows mostly in mountainous topography
leaves
perminal
needle shaped
1 or 2 veins
seed of woody cones is wind- borne
simple cones
pollen cones
single short
unbranched axis
bears microporophylls
can be monoecious and dioecious
cone bracts
long shoots
tiny papery leaves
ovuliferous scale
fused to bract
bear cones
reproductive activities takes place
suspensor
pushes cells
into megagametophyte
proembryo
develops in the embryo
cycadeoidophyta
cycads
evergreen compound leaves
leaves appear basal rosettes
woody trunks
seed cones
pollen cones
sometimes cone like structure
trunks are shorter and stouter
Pteridospermophyta
seed ferns
any woody plants
fern-like foilage
bore seeds
wood was manoxylic
softer/less dense
longer tracheids
longlived
vascular cambium
xylem and phloem
Some resembled ferns
other vines
Division Ginkophyta: Maidenhair tree
Division Cycadeoidophyta
All extinct
Megasporophylls
Microsporophylls
Division of Pteridospermophyta: Seed ferns
Lyginopteris
stenomyelon
Calamopitys
pachytesta incrassata
Woody Plants
Upper Devonian period
fern-like foilage
Division Progymnospermophyta : Progymnosperma
Archaeopteridales
Reproduction is heterosporous
Archaeopteris
Siphonostele
Evolution of seeds
Pollen Chamber
Integuments
Microphyle
Aneurophytales
Eospeematopteris
Trilloxylon
Proteokalon
Aneurophytes
Protopteridium